1: Re: to Jon Risch-walls of books/acoustic treatment (13.44)
Posted by Jon Risch on 1999-04-16, 10:00:11 (207.3.85.97)
They will not absorb much of anything, and to be effectve as diffussors, they must be pulled out and pushed in randomly at least 6" or so, which will look very untidy, and still only be a partial help .......

2: Re: Jon Risch...Can your DIY Acoustic Treatments help my room? (13.44)
Posted by Jon Risch on 2000-07-21, 15:46:06 (209.215.72.183)
There is no doubt that a small reflective room would respond quite well to some acoustic treatment. Since you are bothered more by the mids than anything else, I would recommend building some of the s .......

3: Jon Risch...I want to know more about"DIY Acoustic Treatments" (13.06)
Posted by b06 on 2001-11-06, 03:08:11 (202.64.33.191)
Jon, I can't find your webpage of "Acoustic Treatments" Can you help? Also, I want to learn more about room acoustic even sound engineering. Any reference book/material recommend ? .......

4: Re: Abffussor question for Jon Risch (12.28)
Posted by Jon Risch on 2001-02-15, 01:42:09 (209.215.72.225)
Strips of the OC 705 or 703 fiberglass panels would probably duplicate the retail products, if then covered with FR701 cloth. Some acoustic foam in sheet form might work as well, and be a lot less mes .......

5: Re: Room Acoustic Questions (12.19)
Posted by Jon Risch on 2004-06-15, 10:27:50 (68.222.72.85)
Bass traps and experimenting with speaker placement will help, but it may be that there will always be a certain amount of unevenes in the bass level, your room is just too square. See: My original DI .......

6: PS (12.18)
Posted by Jon Risch on 1999-03-18, 18:59:05 (207.3.84.22)
URL for acoustic note: http://members.xoom.com/Jon_Risch/a1.htm and follow the links. Jon Risch .......

7: Re: acoustic treatment=affordable? (11.88)
Posted by David Aiken on 1999-04-16, 13:44:24 (203.12.171.18)
Given your budget and room size, you may well find Jon Risch's roomlens design highly suitable. The instructions are in the Catch-All pages at Jon Risch's site. Stephen provided the address but I've p .......

8: Re: JON RISCH .versus. DECWARE Room treatments - A Comparative Review (11.84)
Posted by Gary Jacobson on 2000-06-07, 14:22:26 (203.37.199.17)
G'Day, The link is shown below. Clik on the "DIY Acoustic Treatments.." link towards the middle of this page. Gary Jacobson Jon Risch Acoustic Treatments .......

9: Re: Jon Risch Acoustic Treatment Question (11.83)
Posted by Jon Risch on 2003-06-08, 21:55:30 (68.154.129.177)
As noted in the DIY Acoustics note, the semi-rigid panels are nto absolutely necessary for good results IF at least 6" of fiberglass are used in the panel. Spacing the panel out from the wal can help .......

10: PS (11.77)
Posted by Jon Risch on 1999-05-11, 10:31:59 (209.215.72.210)
That was for the RoomLens, which is worth a try. The DIY Acoustic Treatment note link is displayed on the main web page at tmy site. Jon Risch .......

11: Re: Jon Risch : Need your advice on DIY bass trap !! (11.74)
Posted by Jon Risch on 2005-08-24, 17:00:58 (68.19.137.64)
With normal building grade fiberglass at approx. 0.5 lbs per cubic foot density, I recommend compressing a 6" thickness down to 1 3/4". With yours being a little higher density, then compressing down .......

12: Re: A couple of thoughts for Jon Risch (or anyone): Mains and Jitter (11.73)
Posted by Jon Risch on 2001-02-02, 00:34:02 (209.215.72.225)
Actually, to be UL rated (unless they have changed the specs/rulessince I did this), the total capacitance works out to around 0.22 uF, anything more exceeds the leakage current limits for UL. CE is a .......

13: Re: acoustic absorption behind speakers (11.68)
Posted by Jon Risch on 2001-03-25, 11:42:11 (209.215.72.167)
Not very. They might absorb some midrange a bit. If you added some polyester batting, or even towo layer,s then at least they would absorb some HF's as well. Jon Risch .......

14: Re: Acoustic question for Jon Risch (11.49)
Posted by Jon Risch on 2000-04-01, 07:59:32 (209.215.72.173)
The screen will not reflect LF, but will the upper mids and highs, so the reflecting boundary for the upper ranges will have been moved out effectively the 5" the screen is off the wall. If the wall w .......

15: Re: DIY Acoustic Panels (11.49)
Posted by Jon Risch on 2001-12-10, 19:59:40 (209.215.72.216)
Regarding DIY acoustic panels, see: (Note: you may need to go to this URL first, in order for Geocities to allow access: http://www.geocities.com/jonrisch ) The original DIY Acoustic Treatment Note: h .......

16: Alternative material for 703 to be used in Acoustic panel (11.45)
Posted by wbshiu@gmail.com on 2007-12-10, 15:10:08 (138.111.13.250)
Hi, I am new to room treatment and planning to DIY some acoustic panels for my HT room. With the help from Jon Risch and I very much appreciate that, my bass traps are under construction now. Now I am .......

17: Re: Will room lenses help ? I have Jon's bass traps and acoustic panels. ?? No room for lenses? (11.39)
Posted by Jon Risch on 2000-10-13, 20:51:44 (209.215.72.244)
The Room Lens will aid a bit, but the Maggies already have less room interaction than most speakers. I would try some in between, and flanking them to either side if so inclined. At the price of the D .......

18: Re: DIY acoustic panel for Jon (11.33)
Posted by Jon Risch on 2001-03-08, 21:13:56 (209.215.72.188)
The fiberglass should be faced, as it will sag and fall otherwise. The paper helps with the LF absorption slightly, and the rear does not have to have burlap, unless it will be seen. The paper can be .......

19: Re: J.R., can you recommend an ideal material to cover a couch with? (11.21)
Posted by Jon Risch on 2000-06-23, 17:19:39 (209.215.72.188)
Some sort of comforter, which will have a softer material with polyfill in between would probably be best, although thsoe 'fuzzy' thermal blankets might be OK from an acoustic standpoint, they would b .......

20: Re: how is the acoustic center of a driver determined ? nt (11.20)
Posted by Jon Risch on 2001-11-14, 17:31:37 (209.215.72.217)
This is a complex subject, and not even agreed upon by profesisonal speaker designers, so I will not try to describe it in depth here. Suffice it to say that lining up the voice coils does not necessa .......

21: Re: Acoustic foam - what do I do with it (11.17)
Posted by Jon Risch on 2003-02-16, 22:34:21 (67.213.144.236)
Foam is expensive, that is why my DIY acoustic prohjects use fiberglas and polyester batting. See: http://www.geocities.com/jonrisch/a1.htm for some details on where to put treatments. As for te thicj .......

22: Re: Orientation of Risch wall panels (11.11)
Posted by Jon Risch on 2001-10-18, 10:19:23 (209.215.72.221)
My basic assumption is that folks have read my original DIY Acoustic Treament note (see: http://www.geocities.com/jonrisch/a1.htm ) and the portion about treating a room. If all he has are three pane .......

23: Re: acoustic absorbtion panel room placements (11.05)
Posted by Jon Risch on 2000-07-25, 16:53:37 (209.215.72.195)
See: http://members.xoom.com/Jon_Risch/a1.htm the xoom site is quite overloaded, try several times,, and at off peak times if possible. Jon Risch .......

24: Re: acoustic treatment (11.01)
Posted by Jon Risch on 2001-04-02, 01:07:32 (209.215.72.241)
Yes, but if I were doing it, I would try and double up the thickness for a total of 8" depth, this will help match you open side better, as it will absorb down to a lower frequency. BTW, please note t .......

25: Re: Room Isolation Acoustic Treatment (10.94)
Posted by Jon Risch on 2002-01-15, 17:52:15 (209.215.72.224)
Think air seal/islation, rather than insulation or absorbing. Air leaks and very thin surfaces are the worst culprits, as are heating/cooling ducts, etc. Not a lot you can do that is not permanent, ex .......

26: No Doubt About It - Acoustic Treatments (10.94)
Posted by Jon Risch on 2003-04-03, 17:22:30 (67.213.144.88)
The hands down winner would be DIY Acoustic treatments for a room, the whole package as described in the first paragraph of: http://www.geocities.com/jonrisch/a1.htmA which amounts to around $470 tota .......

27: Re: Different acoustic properties of lead and steel? (10.94)
Posted by Jon Risch on 2000-05-07, 09:32:25 (209.215.72.245)
Steel rings and carries sound. Lead is acoustically dead. If you were NOT going to use real lead shot, you would be better off using just the sand. Jon Risch .......

28: Re: DIY Tube trap and fiberglass density (10.92)
Posted by Jon Risch on 2001-11-20, 20:53:23 (209.215.72.243)
The fiberglass density is essentially the "R" in an acoustic RC network. Too low a density will not provide enough acoustic resistance, and not enough damping action. Bass damping capability of the tr .......

29: Re: Who is this Jon Risch fellow? ;) (10.83)
Posted by Jon Risch on 2001-03-06, 22:18:32 (209.215.72.161)
I am an audio hobbyist with a great deal of interest in audio cables and low cost system/component tweaks. I have a web site at: http://members.nbci.com/Jon_Risch/index.htm where I make available most .......

30: Re: Dead room acoustics (10.81)
Posted by Jon Risch on 2001-04-26, 13:41:12 (209.215.72.234)
It may be that bass modes are makig the highs sound weak by comparison, and so bass traps in the corners might actually be better overall. Search the Tweaker's Asylum using my name and acoustic as sea .......

31: Re: DIY RGB diffusors.... (10.81)
Posted by Jon Risch on 1999-06-22, 16:33:45 (209.215.72.210)
See: /audio/tweaks/messages/1725.html and see if this is what yuou want. For the most part, proper room treatment requires a number of different acoustic strategies. There is the Argwent Room Lens app .......

32: to Jon Risch-walls of books/acoustic treatment (10.74)
Posted by paul on 1999-04-15, 21:48:11 (152.163.204.73)
::p::: Jon can walls of books(along perimeter of walls, different sizes of books)-behave as an acoustic treatment or create an anechoic effect? thanks::p::: .......

33: Re: Jon: Will I benefit from your power transformer project? (10.68)
Posted by Jon Risch on 1999-03-09, 17:03:31 (207.3.85.99)
Samir, I appreciate your confidence in my DIY posts, but this one is kind of out there for most. IF you are having obvious AC power line noise problems, hum, etc. then this may be worth a try, otherwi .......

34: Re: jon risch acoustic panels ? about construction (10.66)
Posted by Jon Risch on 2000-07-21, 16:12:46 (209.215.72.183)
If you are not going to use the rock wool panels, and these are not really necessary of you use thicker than 6-8" of fiberglass, then you can staple to the rear of the frame wood. It was stated that w .......

35: Re: DIY Tube Traps?? (10.64)
Posted by Jon Risch on 1999-10-27, 14:54:11 (209.215.72.171)
How quick they forget! See my website for a DIY note on Acoustic treatments: http://members.xoom.com/Jon_Risch/ Included is plans for sound absorbing wall panles, bass traps, etc. including placement .......

36: Re: Tube Trap - Question for John Risch (10.57)
Posted by Jon Risch on 2001-09-02, 08:48:46 (209.215.72.208)
Resistive bass traps, ala ASC and the DIY bass traps I post about, work on the principle of using acoustic resistance. The outer layer of material, in the case of the DIY traps, the fiberglass compres .......

37: Re: Jon Risch! Panels questions (10.56)
Posted by Jon Risch on 2001-09-23, 09:51:25 (209.215.72.218)
The absorption characteristics can be found at the OC web site, or at one of the other manufactuer's of fiberglass (they are all prety much the same of a given thickness). For info on DIY Acoustic Tre .......

38: Re: Acoustic absorber panel question (10.54)
Posted by Jon Risch on 2006-04-01, 20:54:58 (70.157.5.80)
I do not recommend attempting to build a 1/4 round, or even a 1/2 round, as they are going to be dificult to construct properly, and get the full benefit of what is possible. This includs the sqaure a .......

39: Re: Question for Jon Risch re: acoustic panels (10.54)
Posted by Jon Risch on 2007-02-11, 19:51:34 (70.152.107.206)
I am not sure that I am following your train of thought correctly. Wall panels do not need to be "sealed", in fact, it is a mistake to place a solid board on the back of the panel, and even perf board .......

40: Re: Ceiling absorbtion (10.52)
Posted by Jon Risch on 2000-08-12, 19:47:12 (209.215.72.188)
There is really only one thing to watch for, and that is the ceiling tiles that are not rated as acoustic types. These typically have absorption coefficients in the 0.17 to 0.3 range in the mids and h .......

41: Re: advice sought on acoustic panel (10.48)
Posted by Jon Risch on 2002-07-08, 10:23:27 (209.215.72.233)
You would want it more reflective than absorptive. Some folks have reported good results by using a couple of DIY room lens at such borders in a room, these provide some back scatter, but it is diffus .......

42: Re: question for Gary Jacobson Re: Jon Risch's diy acoustic treatments......... (10.48)
Posted by Jon Risch on 2000-08-28, 16:47:46 (209.215.72.216)
The burlap is also called jute. R2.5 is going to be about equiv. to 3" of fiberglass, the minimum recommended thickness. R3.5 as you say, being 6" thick or so would be much better for either a wall pa .......

43: Re: Question for Jon Risch re: acoustic panels (10.47)
Posted by Deaf Ear on 2007-02-12, 05:57:03 (70.129.252.1)
Thanks Jon, I was confusing two separate issues. DE .......

44: Re: Jon Risch bass traps and panels.. My room goes boom boom (10.46)
Posted by Jon Risch on 2005-10-19, 19:34:29 (68.222.71.33)
Yes, the big multi-roll bags would be fine, as long as the price is not an impediment for you. Re using acoustical ceiling tiles or other types of 'acoustic baord' on the rear of one of my DIY sound a .......

45: Re: DIY acoustic wall treatments (10.42)
Posted by Tom �. on 1999-07-19, 19:22:38 (166.62.166.35)
Jon Risch's recipe seems to work well for me (and many others). I put a link below to his website. Here is a nice shortcut in construction I found: /audio/tweaks/messages/740.html I saw the responses .......

46: Re: for Jon Risch (10.40)
Posted by Jon Risch on 2001-03-09, 13:21:24 (209.215.72.177)
I had considered this at one point, but there are decent DIY and kits out there. While I am sure I could edesign a great bang-for-the-buck DIY speaker system, OR a SOTA DIY system, the vast realm in b .......

47: Re: DIY acoustic panel for Jon (10.34)
Posted by Jon Risch on 2001-03-09, 13:27:18 (209.215.72.177)
First, the fiberglass paper backing does not have to be glued, there is no requirement for an air seal. In the original recipe, the rear of the paper had a strip of polyester batting down the middle, .......

48: Re: JR or someone about IDY sound panels (10.28)
Posted by Jon Risch on 2002-07-23, 07:47:11 (209.215.72.182)
For some time now, the DIY Acoustic Treatment note has stated that the use of the rock wool panel, or the alternative OC 700 series panels, was optional, and not necessary if you were going to use fib .......

49: Re: Does "egg crate" foam have any use as a acoustic treatment? (10.28)
Posted by Jon Risch on 2000-08-10, 15:45:50 (209.215.72.189)
The very thin depth, and the fact that it is not desiogned as an acoustic absorber combione to make it a poor choice for acoustic treatment. See: http://www.acousticsfirst.com/eggc.htm IF you want to .......

50: Re: Can Acoustic Ceiling Tile be used on walls: (10.25)
Posted by Jon Risch on 2005-01-24, 16:52:17 (65.12.40.97)
Most acoustic ceiling tiles are not that great at absorbing sound in the first place, they are merely better than a solid ceiling, period. They are so thin, and the HF absorption is usually poor too, .......

51: Re: Jon Risch DIY Wall Panel Positioning Question (10.22)
Posted by Jon Risch on 2004-09-10, 22:42:21 (68.222.64.37)
In general, you have the panels where they need to be for best results. Of course, every room is slightly different, but for the typical room pressed into service for a sound room, the placement recom .......

52: Re: HOW DO I BUILD MY OWN SOUND ABSORBERS (10.22)
Posted by Jon Risch on 2001-09-16, 22:39:19 (209.215.72.214)
See: http://www.geocities.com/jonrisch/a.htm AND http://www.geocities.com/jonrisch/a4.htm these link to all the DIY Acoustic Treatment info. Jon Risch .......

53: Re: Please help me with my room (10.16)
Posted by Jon Risch on 2004-02-08, 16:30:40 (68.212.172.188)
See: The original DIY Acoustic Treatment Note: http://www.geocities.com/jonrisch/a1.htm AND http://www.geocities.com/jonrisch/a4.htm Jon Risch .......

54: Questions on Jon Risch DIY wall panels (10.16)
Posted by Ole on 2005-02-06, 10:26:29 (84.48.48.7)
Please pardon my ignorance but I have a few questions on the Jon Risch DIY wall panels I hope someone can answer. 1. When explaining the acoustic sandwich he mentions “paper of fiberglass roll”. Is th .......

55: Re: Help on ideas for practice room resonance control for a professional musician. (10.12)
Posted by Jon Risch on 2001-08-16, 18:40:16 (209.215.72.165)
See: http://www.geocities.com/jonrisch/a.htm AND http://www.geocities.com/jonrisch/a4.htm for info on DIY Acoustic Absorbing devices and materials. Jon Risch .......

56: Re: Q for Jon Risch re: Room treatments (10.08)
Posted by Jon Risch on 2001-10-22, 10:20:44 (209.215.72.229)
They sound like the kinds of foam used for insulating the walls. They are not effective as sound absorbing material. The semi-rigid fiberglass panels are available from Certainteed, John-Mansville, an .......

57: Re: Acoustic question for Jon Risch (10.07)
Posted by Jon Risch on 2001-02-16, 21:07:40 (209.215.72.226)
Comb filtering is usually not a result of the room itself, but of two seperate active sound sources in close, but not close enough proximity, and the result is a series of peaks and dips ALL across th .......

58: Re: Room treatments for a LARGE hall (10.03)
Posted by Jon Risch on 2001-07-08, 12:43:36 (209.215.72.231)
Trying to do a building after the fact is very difficulkt at best, and if you can not block off the windows/glass, then it is doubly difficult. You might consider an acoustic absorbing "shell" around .......

59: Re: Listening Room Tweeks (10.00)
Posted by Jon Risch on 2005-02-10, 20:22:09 (68.19.137.204)
See: The original DIY Acoustic Treatment Note: http://www.geocities.com/jonrisch/a1.htm About 1/2 way down is the recpe for DIY bass traps ala ASC, and toward the bottom, a recommended room treatment .......

60: Re: Attn: Jon Risch re: Large Glass Doors (acoustic treatment) (9.98)
Posted by Jon Risch on 2000-03-08, 17:35:01 (209.215.72.243)
If the spouse will allow, a sound absorbing panel per my DIY isntructions would help quite abit, as these are not needed to be permanantly installed (in fact, the specified DIY version is merely leane .......

61: Re: Studio Acoustic Tiles/panels for listening room? (9.95)
Posted by Jon Risch on 2002-08-13, 17:59:48 (209.215.72.191)
These foam tiles or sheets are typically too thin to absorb down low enough to provide a balanced sound. The result is that many people that try using these (or other inadequate acoustic absorbers suc .......

62: Re: Need help in room acoustics please! (9.95)
Posted by Jon Risch on 2002-06-06, 17:27:16 (209.215.72.237)
See: http://www.geocities.com/jonrisch/a.htm for articles on room acoustic set up, and inexpensive DIY treatments. Pay particular attention to this one: http://www.geocities.com/jonrisch/a1.htm Jon Ri .......

63: Re: I went through 266 posts under "search for Panels" but couldnt get a clearcut answer.- The most I can compress 10.5" R-30 without reflecting the highs on my acoustic panel- ITS MY WIFE. (9.90)
Posted by Jon Risch on 2000-09-30, 16:01:06 (209.215.72.170)
You can comress the fiberglass up to about 2 times without any problems whatsoever, if the polyfil covering is not compressed, then this should take care of the extreme HF's anyway. Remember, I am bas .......

64: Re: Jon Risch's wall panels, link to a picture ?????? (9.89)
Posted by Jon Risch on 2006-05-16, 20:03:21 (68.222.113.186)
There is also this one: http://gallery.audioasylum.com/cgi/view.mpl?UserImages=31994&session= I am assuming that you saw the pics at my web site, but those are of the completed ones. http://www.geocit .......

65: Re: thanks a zillion, Jon. How about my TV? (9.81)
Posted by rob selina on 1999-05-05, 20:46:29 (208.128.37.149)
i personally HATE using matresses for sound absorbtion. If I were you I'd construct one of the acoustic treatments Jon Risch has on his page and move it infront of the tv when listening .......

66: Re: For Jon Risch and anyone. I think "Ear Muffs are my only hope. Do they work? Can they still be bought? Or made. (9.78)
Posted by Jon Risch on 2001-02-27, 13:20:02 (209.215.72.203)
I do not think they are still being sold, they used to run adds in the back of Audio magazine, and sometimes others. You could make a set of your own DIY Ear Muffs, the hard part is the frame. Perhaps .......

67: Re: acoustic panels DIY (9.75)
Posted by Tom �. on 2000-03-19, 06:02:31 (209.181.213.15)
Jon Risch's DIY acoustic panels. Tom �. .......

68: Re: A question for Mr. Risch (9.71)
Posted by Jon Risch on 2000-12-13, 15:57:15 (209.215.72.167)
It depends. If you want maximum deadening of sound, use two layers of 3 1/2" kraft backed, and staple the first layer with the paper down, and the second layer with the paper up. Prevents midrange ref .......

69: Re: Carpet Padding as Bass Trap Material? How about... (9.71)
Posted by Jon Risch on 2001-03-11, 11:31:31 (209.215.72.173)
You don't just fill the trap up, it uses compressed fiberglass rolls to provide the acoustic resistance to make it work well. The compressed fiberglass ends upo froming a cylinder with wooden end caps .......

70: Re: Attn: Jon Risch re: Large Glass Doors (acoustic treatment) (9.67)
Posted by Gary Jacobson on 2000-03-08, 19:00:31 (203.37.199.13)
Ta Jon, SAF or WAF is somewhat of a consideration, but I may get away with my life! Thanks again. Regards, Gary Jacobson .......

71: Re: Question for John R. about Sonex foam pannels (9.65)
Posted by Jon Risch on 2000-11-19, 21:11:28 (209.215.72.218)
You don't say how thick they are, but I am guessing the 2" variety. The first thing you should do if they are only 2" or 3" thick, is DOUBLE UP THE THICKNESS. This will avoid the usual acoustic treatm .......

72: Re: For J. Risch: Owens Corning Panels 703 vs 705 (9.65)
Posted by Jon Risch on 2000-02-01, 12:51:57 (209.215.72.192)
You really don't need to use the panels on the back for front fiberglass thicknesses greater thann 6". The use of the rock wool/OC 700 panels was to increase LF absorption while maintaining a compact .......

73: Re: Crossovers: combining first and second orders (9.57)
Posted by Jon Risch on 1999-10-26, 17:16:19 (209.215.72.248)
Do not be concerned about the various orders, and mixing them. The acoustic roll-offs of the drivers add to the electical filters, and the total combined phaseshifts etc. are what you end up with. If .......

74: Attn: Jon Risch re: Large Glass Doors (acoustic treatment) (9.56)
Posted by Gary Jacobson on 2000-03-08, 14:35:53 (203.37.199.13)
G'Day Jon, I hope I can impose once more on your valuable time. In the case where a glass door 3 metres wide and 1.8 metres high is between and behind the speaker system, what would you suggest to be .......

75: Re: Is this a good idea? (9.56)
Posted by Jon Risch on 1999-07-28, 07:59:53 (209.215.72.210)
Egg crate foam, as typically available for bedding, is not very good acoustically, as it tends to reflect some of the HF's, and does not absorb the bass as well as foam designed for acoustic purposes. .......

76: Re: Does "egg crate" foam have any use as a acoustic treatment? (9.52)
Posted by Jon Risch on 2000-08-12, 14:13:22 (209.215.72.232)
Diffussors are good for certain applications, but so far, using JUST diffussors does not seem to do the job as well as a mixture of absorbers and diffussors. See the last part of my DIY Acoustics note .......

77: Re: wich are more effective panels or roomlens (9.49)
Posted by Jon Risch on 2000-01-31, 10:25:34 (209.215.72.210)
The sound absorbing panels and bass traps are in my DIY Acoustic treatment note at: http://members.xoom.com/Jon_Risch/a1.htm and the DIY Room Lens is at: note at: http://members.xoom.com/Jon_Risch/cat .......

78: Re: Acoustic Panel with 8" depth. If poly goes over this, should you try NOT to compress the fiberglass ????? (9.42)
Posted by Jon Risch on 2000-09-27, 20:30:39 (209.215.72.225)
A slight amount of compression is no problem, if you read my note, I talk about frames that are less than the thickness of the fiberglass, and the fiberglass gets compressed a bit at the edges. There .......

79: Re: Question for Jon Risch re: acoustic panels (9.39)
Posted by Deaf Ear on 2007-02-04, 20:42:56 (70.129.252.1)
Thanks Jon, I recall reading somewhere that you recommend the whole wall frame be a sealed unit. If I butt 2(2x4) together to make a 4x4, do you recommend gluing the edges together with liquid nails? .......

80: Re: mounting board for acoustic foam? (9.38)
Posted by Jon Risch on 2002-09-19, 21:42:04 (209.215.72.242)
You don't want a hard material behind the foam, so make an edge frame from 1X4's, and glue the foam to this frame, which can then be hung, have legs, etc. Make the outside of the frame a few inches sm .......

81: Re: 16 x 16 x 8' room & bass suckout - Suggestions??? (9.37)
Posted by Jon Risch on 2000-02-29, 22:07:31 (209.215.72.251)
Since yourroom has so many stacked up dimensions, I doubt that just a pair of bass traps in the front vcorners will do the job. It will likely take a full set in each corner, and some at the halfway p .......

82: Re: acoustic absorbtion panel room placements (9.34)
Posted by Jon Risch on 2000-07-22, 08:59:44 (209.215.72.185)
Your situation with the K-horns is unique, and the placement you have may be the best solution. As a test, I would try placing both panels side by side in the middle of the front wall, and see if this .......

83: Re: Room treatment (9.33)
Posted by Jim on 2001-01-02, 15:26:27 (24.216.64.15)
I agree that the place to start is in Jon Risch's pages in the FAQ section. I also found that the Room treatment section at www.decware.com has some very informative articles. I am currently in the pr .......

84: Re: Jon Risch, can you please help me with room acoustics! (9.31)
Posted by Jon Risch on 2002-02-10, 09:12:51 (209.215.72.216)
First, you would get more benefit from the bass traps if they were upright in the front corners. Second, wall panels at the first reflection points will help with the HF harshness, but not very much w .......

85: Re: Can these NRC values be real for a 3" panel? (9.31)
Posted by Jon Risch on 2001-05-09, 19:56:34 (209.215.72.183)
It helps to know these numbers are 'raw', that is, they have not been converted to dB attenuation. 0.5 is 6 dB of absorption. Just like going by the -3 dB point of a speaker, for acoustic absorption, .......

86: Re: Sound panels - premium DIY version (9.30)
Posted by Jon Risch on 2000-11-13, 10:30:02 (209.215.72.233)
Please be aware that 2" thick of even slightly denser fiberglass is not going to absorb down as low as 3 1/2 with a layer of polyester batting, or 6" fiberglass, etc. Without the batting, they may ref .......

87: Re: What Material(s) Can I Use to Make My Own Echo Trap (9.28)
Posted by Jon Risch on 2004-04-05, 10:20:01 (68.212.173.201)
See: The original DIY Acoustic Treatment Note: http://www.geocities.com/jonrisch/a1.htm and all the acoustics info at: http://www.geocities.com/jonrisch/a.htm Carpet is not a very good acoustic absorb .......

88: Re: Ping Jon, room treatment questions (9.28)
Posted by Jon Risch on 2006-10-31, 10:33:19 (68.222.113.84)
Actually, with a di-pole speaker, placing a bass trap directly behind such a speaker can actually INCREASE the amount of perceived bass. This occurs because the backwave from the open baffle speaker w .......

89: Re: Effective DIY on wall acoustic treatments (9.25)
Posted by Jon Risch on 2002-06-19, 10:27:16 (209.215.72.242)
Egg cartons do not make very good sound absorbers. See: http://www.acousticsfirst.com/eggc.htm Placing MDF behind the egg cartons will not help either, as it will provide a reflective barrier. For low .......

90: Re: DIY Bass Trap Question (9.23)
Posted by Jon Risch on 2000-06-02, 20:57:39 (209.215.72.171)
The DIY resistive bass trap in my recipe is not tuned at all, but depends on the resistive action of the compressed fiberglass and the air volume inside to acheive its bass damping. There is a corner .......

91: RE: How high should I hang the 2'x4' Acoustic Panel? (9.22)
Posted by Jon Risch on 2008-01-19, 10:54:09 (68.222.71.214)
My general advice has been to center them top to bottom of the wall, but one can also center them on the height of the speakers tweeter/midrange with good effectiveness. My recommended panel size has .......

92: ?????? (9.20)
Posted by Jon Risch on 2004-04-19, 18:24:52 (68.19.132.205)
You seem confused about what diffraction is. I am talking about the re-radiation of energy at the sudden discontinuity of the baffle edges. This is called diffraction. This will occur for most dome tw .......

93: Re: Which DIY Acoustic treatments do you prefer (9.16)
Posted by David Aiken on 2001-12-03, 12:04:45 (203.54.128.186)
I use versions of Jon Risch's quick and dirty bass traps and his room lens clone. The bass traps do wonders for reducing room reverberation. The room lenses are great for killing early reflections by .......

94: Room Acoustic Treatments (9.16)
Posted by MikeWI on 2012-04-04, 14:06:21 (207.250.40.227)
Room acoustic treatments are the most significant by far. Jon Risch tube traps, absorbing panels and ceiling corner absorbers. Balanced AC Power was next, including separate AC isolation for digital ( .......

95: Re: compromise room treatments (9.16)
Posted by Jon Risch on 1999-11-10, 16:20:15 (209.215.72.164)
Ceiling tiles do some good, but they can differ a great deal in how much they will absorb. Those RATED for use as sound absorbing tiles WILL be better than a plain ceiling. The very best acoustic abso .......

96: Re: A New Inexpensive DIY Acoustic Panel Source? (9.13)
Posted by Jon Risch on 2003-04-21, 20:41:50 (67.213.144.18)
Unfortunately, the regular spacing and depth of the corrugations will only disperse a certain band of frequencies, (and some harmonics), and allow frequencies below the 'cut-off' point to reflect more .......

97: Re: Acoustic absorber panel question (9.12)
Posted by Jon Risch on 2006-04-01, 20:52:51 (70.157.5.80)
If you seal the back air tight, then there will be reflections at certain frequencies, and any spacing behind the panel will be partially wasted. However, if you "paint" the rubber onto a rough fiberg .......

98: Re: Attn Jon Risch - Improving Bass on Maggies with Baffles (9.10)
Posted by Jon Risch on 2000-05-04, 10:32:49 (209.215.72.222)
Building a stiff, sturdy box that size is a challange, but realize that it is NOT actually attached to the planar speaker, just butted up agaihnst it with foam sealing strips, hence very little of the .......

99: I am, certainly, no expert .... (9.09)
Posted by Julien43 on 2006-04-07, 03:07:20 (65.1.190.175)
My previous post are based on what I have learned here and from reading John Risch's Acoustic Treatments Info and DIY Notes (can be found in the FAQ section) Here is a link to one of Mr Risch's posts .......

100: Re: Which DIY Room Lense? Jon's or Greg's (9.07)
Posted by Jon Risch on 2000-02-25, 21:05:37 (209.215.72.229)
My instructions will result in a virtual clone of the Argent device, while Greg Weavers uses different spacings and tube diameters. I am guessing that he wanted to make them go down to a lower frequen .......

101: Partially Recreated EchoMuffs (9.07)
Posted by Jon Risch on 2000-11-23, 07:26:00 (209.215.72.231)
There was a product, I believe called EchoMuffs, that essentially was a foam hood for the top of the speaker, with three sides and the top foam walls. This would prevent most all of the mid and HF sou .......

102: Re: A new type of bass trap/diffuser - hype or real deal? (long) (9.04)
Posted by Jon Risch on 2005-08-29, 09:20:24 (68.19.137.64)
Short version for now: Deep bass absorption vs. midbass require different optimizations of the trap parameters, their trap was obviously optimizd for deep bass absorption, but this means that the mid- .......

103: Good input here (9.02)
Posted by Jon Risch on 2007-11-07, 16:40:40 (72.147.228.210)
Now that I have seen a photo of the other end of the room, Dave's suggestions have merit, and would be at least as effective as totally reversing the room, etc. For a quick taste of what it might soun .......

104: Re: Try Room Tunes (9.02)
Posted by Jon Risch on 2006-11-06, 17:31:09 (68.222.113.84)
A Room Tunes Kit is NOT going to control a 50 Hz room mode with any significance. Yes, it probably will help provide a superior overall room acoustic, but the materials included do not have the sheer .......

105: Re: Jon Risch! Room Panel treatment question (9.01)
Posted by Jon Risch on 2001-09-20, 21:56:19 (209.215.72.224)
Ceiling tiles are not suitable as substitutes for the OC 700 series or the rock wool panels. The OC 700 series should be able to be ordered from just about any commercial building supplier who deals i .......

106: Re: Can Acoustic Ceiling Tile be used on walls: (8.95)
Posted by Chris_F on 2005-01-24, 05:00:07 (129.86.240.204)
I've had good success with carpet squares. Just go to your favorite carpet store and ask them if they sell their old samples. I bought four 2'x3' carpet square samples for $2.00. It's hard to beat $0. .......

107: acoustic panels (8.94)
Posted by carter9000 on 2008-03-05, 21:30:34 (76.87.113.227)
I plan on building Jon Risch's acoustic fiberglass panels. At the same time I am hanging curtains all along the wall behind my speakers from floor to ceiling as part of my home theater. My question is .......

108: Re: Wall Panel [Acoustic Treatment] Question - Jon??? (8.93)
Posted by Jon Risch on 2002-04-03, 16:37:50 (209.215.72.201)
I would not try to compress 6 1/2" of fiberglass into a 2" frame all across the frame. My frame and fiberglass sizings were meant to lightly compress the fiberglass at the edges only, e.g., 6 1/2" of .......

109: Re: RPG Skyline / QRD diffusors dimensions? (8.93)
Posted by Jon Risch on 2001-01-27, 09:06:05 (209.215.72.168)
See this post: http://www.AudioAsylum.com/audio/tweaks/messages/24954.html and for info on a DIYU diffussor using poly cylindrical specular diffussion, see: DIY Diffussor URL: http://www.AudioAsylum.c .......

110: jon risch's DIY (8.86)
Posted by temporarymadness@aol.com on 2008-02-04, 05:24:25 (71.81.255.230)
a couple questions about jon risch's DIY acoustic panels: http://www.geocities.com/jonrisch/a1.htm 1) is there any substitution that someone can use instead of rockwool for the back of the panels? 2) .......

111: Wrong (8.78)
Posted by Jon Risch on 2006-04-10, 21:08:13 (72.147.192.54)
Breathing through a cloth is NOT definitve for how much sound it will reflect, or not. It may be somewhat helpful to determine of the cloth culd be used on a bass trap that was not required to be whol .......

112: Re: Phase question- planar/ribbin VS. cone/dome - for the technical guys (8.76)
Posted by Jon Risch on 2001-11-12, 21:41:00 (209.215.72.189)
Nope, all the transducer types you mention do not have any INHERENT phase difference from each other. Acoustic centers are going to be different, due to the nature of the beasts, but this is not a 'ph .......

113: The last one I tried?... (8.75)
Posted by David Aiken on 2003-04-04, 22:47:17 (203.134.42.224)
Seriously, I know it's hard to go past Jon Risch's assessment of acoustic treatments but I almost think it's a tossup between acoustic treatments and vibration/resonance control. Some of the audible r .......

114: jon risch diy acoustic panel backing (8.74)
Posted by jeff gr on 2002-11-09, 08:48:31 (65.93.101.248)
if you don't use the rock wool on the back of the fiberglass panels, what can be used instead? .......

115: Re: DIY room lens stability (8.74)
Posted by Jon Risch on 2001-09-21, 10:38:50 (209.215.72.179)
The pipes are suppossed to be open (with some acoustic sstuffing inside) so that they can act as Helmholtz resonators for the floor to ceiling mode. However, the absorbing action is small, and if you .......

116: RE: Thank you, Jon, as always; follow-up questions: (8.72)
Posted by Jon Risch on 2008-02-21, 10:29:17 (68.19.146.155)
1. You could use hogwire instead of cardboard, but why? The hogwire is a pain to work with, the cardboard easy. 2. Nah, the foam should be OK acoustically for corner use if it has the convoluted surfa .......

117: Re: Coeff. of acoustic absorption (8.71)
Posted by Jon Risch on 2000-01-04, 16:32:32 (209.215.72.216)
Check out my DIY Acoustic treatments note at: http://members.xoom.com/Jon_Risch/a1.htm In it there arer URL's for acoustics web site, several of which will have info on wall covering coefficients. How .......

118: Re: Jon Risch -- question about lazy design of bass traps (8.71)
Posted by Jon Risch on 2000-09-20, 16:26:14 (209.215.72.166)
[ would it be effective to remove that wrapper, leaving the poly in as virginal a shape as possible, and then wrapping it with burlap or otherwise confining it? ] You could do this, see below. [ The p .......

119: Re: does it havetobe glasfiber in the tubetrap?? (8.69)
Posted by Jon Risch on 2001-07-20, 13:19:24 (209.215.72.241)
You can use polyester batting, the hi-loft kind which starts out at the same density as building fiberglass, but is more expensive to build the traps with. Since acoustic foam tends to close up when c .......

120: Re: Which DIY Acoustic treatments do you prefer (8.66)
Posted by GaryM on 2001-12-03, 16:51:02 (205.247.238.72)
If it is Jon Risch's DIY items that you're in search of, detailed instructions can be found at his website. .......

121: Re: Jon--Q regarding treatment of large centered RPTV (8.66)
Posted by Jon Risch on 1999-11-17, 10:38:29 (209.215.72.239)
Indeed, some folks I have been in correspondence witrh have used home-made (or retail) Room Lens on either side of the front of the TV to good effect. Use of a pair this way did not seem to require re .......

122: DIY Is Not Hard (8.65)
Posted by Jon Risch on 2006-03-14, 16:01:44 (68.222.74.33)
See: http://www.geocities.com/jonrisch/a1.htm This note includes info onhopw to make your own bass traps, wall panels, and how to treat a typical room with both. Also see: the original post where I re .......

123: Sigh. (8.63)
Posted by Jon Risch on 2003-11-02, 17:55:41 (68.154.139.173)
It would really help if you actually read my original DIY note at: http://www.geocities.com/jonrisch/a1.htm Sealed as in air tight around the periphery of the compressed fiberglass, or the higher dens .......

124: Re: Alternative DIY bass trap design (8.59)
Posted by Jon Risch on 2004-07-29, 10:30:36 (68.222.75.87)
Yes I have. They can make decent wall panels, but a simple 2" thickness is not going to go down very low in absorption, and will certainly not make a bass trap level of bass absorption. As a sort of e .......

125: There are better DIY materials (8.58)
Posted by pburant on 2003-02-25, 13:44:03 (4.17.99.95)
Check out Jon Risch's web site (there is a link to it in he Asylum FAQ's). He has lots and lots of great info about DIY acoustic treatments. The foam you're looking at is not likely dense enough to be .......

126: Question for Jon Risch re: acoustic panels (8.56)
Posted by Deaf Ear on 2007-02-01, 22:46:16 (70.129.11.222)
Hello Jon, I believe I may have a source for 2'x4'x2" boards of Owens-Corning 703. If framed up as per your DIY recommendations, how many boards would I need in one frame to make up the required thick .......

127: Re: To: Jon Risch (8.56)
Posted by Jon Risch on 1999-08-26, 19:36:36 (209.215.72.230)
I call out several foam suppliers in my Acoustic note, see: http://members.xoom.com/Jon_Risch/a1.htm also there would be a lot more listed in the web site URL I reference that lists hundreds of acoust .......

128: Re: Room acoustics (8.54)
Posted by Jon Risch on 2001-12-04, 16:27:03 (209.215.72.232)
You would want to balance the right side with the left, by using a sound absorbing panel on the right wall. See: The original DIY Acoustic Treatment Note: http://www.geocities.com/jonrisch/a1.htm (Not .......

129: Re: room treatments (8.53)
Posted by Jon Risch on 2003-05-29, 21:39:14 (68.154.139.105)
The thicker the better, and yes, cover the fiberglass with polyester batting to help keep the glass fibers under control. However, DO NOT place these panels all over the whole room. To get effective r .......

130: Re: i keep thinking this is okay... (8.52)
Posted by Jon Risch on 2003-11-29, 13:26:38 (68.19.147.236)
While the semi-rigid 700 series might sem that just acloth covering is OK, it is still fiberglass, and can still shed small pieces when moved or brushed against. This is why I recomend using a layer o .......

131: Re: Suspend Profoam away from wall? (8.52)
Posted by Jon Risch on 1999-12-28, 19:28:16 (209.215.72.241)
Yes. The more (up to aboput 6-8 inches) the better. FOr even better results, place some fiberrglass behind it, or if the thought of iitchy fiberglass bothers you, use polyester batting insterad, or us .......

132: Mr. Risch - follow-up (8.49)
Posted by LeftistElf on 2003-11-29, 21:47:05 (24.126.246.179)
Jon - what performance should one expect from a OC 703 board wrapped with batting, and then wrapped with an acoustic fabric? .......

133: Re: Jon Risch bass traps and panels.. My room goes boom boom (8.46)
Posted by Aaron 01 on 2005-10-18, 17:45:03 (71.33.198.125)
Thanks for the input Jon, I went to Home Depot today to see what was available and I noticed they had these large bags with 11 batts of 10.25" thick fiberglass insulation 16" wide x 48" long. This lar .......

134: Re: Your top 5 tweaks (8.46)
Posted by Batman on 2003-07-22, 16:39:11 (68.162.138.31)
1. Acoustic Treatment of my room 2. Balanced power all around 3. Sandbox for my Teres TT 4. Mods to my Art DI/O 5. Jon Risch Digital Filter .......

135: RE: Ask or search on Jon Risch's posts (8.43)
Posted by bogartg on 2007-11-11, 07:54:52 (24.5.101.15)
With regard to fabric, Guilford of Maine sells acoustic fabrics that works well to properly cover fiberglass, though obviously not a solution for artwork. .......

136: Re: to Jon Risch-walls of books/acoustic treatment (8.43)
Posted by paul on 1999-04-16, 22:34:06 (205.188.192.157)
::p::: ...then I have a problem. I do have one big wall free,no books, I wonder if the panels you have designed were painted if they would lose their impact, surely not?::p::: .......

137: RE: Acoustic Reflection panel design questions (8.40)
Posted by Jon Risch on 2007-11-07, 16:44:20 (72.147.228.210)
Adding sound absorbing material of a moderate to high density on the back of such diffusor panels would absorb some bass energy, esp. if the panels were spaced off the wall a few inches. So while the .......

138: Re: How do I build a anechoic speaker enclosure and what material to use.....Is it worth the trouble? (8.39)
Posted by Jon Risch on 2001-01-16, 11:41:19 (209.215.72.163)
I am not quite sure what you mena by an anechoic speaker enclosure. An anechoic chamber attempts to absorb all the sound within it, so as to allow no refelctions to contaminate measurements. If by use .......

139: RE: John Risch, regarding your basstraps, could you pls point me at the current URLs detailing... (8.38)
Posted by Jon Risch on 2008-04-27, 19:11:20 (68.19.134.26)
Jeffrey, The locations you show WOULD work, but a 1/4 round ASC type trap would need to be very large (12" radius)to give the same results as even an 11" diameter round placed where the bookcases are .......

140: Re: Sources for parts. (8.37)
Posted by Paul_A on 2007-03-22, 19:09:36 (74.72.252.209)
Thanks for taking the time to list all of these materials. Acoustic surfaces is an interesting place. The pipe insulation is a great alternative to the Jon Risch cage solution. Thanks! .......

141: Re: Questions about the Jon Risch Basstraps (8.36)
Posted by Jon Risch on 2002-09-07, 13:20:59 (209.215.72.222)
See: The problems with pipe insulation for bass traps: http://www.AudioAsylum.com/audio/tweaks/messages/57035.html http://www.AudioAsylum.com/audio/tweaks/messages/6425.html AND http://www.AudioAsylum .......

142: Re: DIY tube trap. (8.35)
Posted by Jon Risch on 2001-11-15, 10:16:02 (209.215.72.210)
See: http://www.tubetrap.com/tt-spec.htm The DIY traps should work as well as the ASC devices, as long as you build them correctly. See: The original DIY Acoustic Treatment Note: http://www.geocities. .......

143: Re: A quick room question (8.33)
Posted by Jon Risch on 2003-09-12, 21:23:28 (67.32.236.191)
Potted plants will not absorb bass ti any significant extent, no atter where they are placed. Large plants with a lot of large leaves can sometimes aid difussion a little, but even here their effect i .......

144: Re: Jon R: painting acoustic panels (8.31)
Posted by Jon Risch on 1999-04-17, 15:19:50 (207.3.85.109)
Paint on any acoustic surface is a no-no, and will cause HF reflectance. First, check out Wal-Mart for the different colors of burlap (it may be called jute), they have green, blue, red, yellow, brown .......

145: Re: Which DIY Acoustic treatments do you prefer (8.31)
Posted by Frosty on 2001-12-04, 04:51:11 (4.48.154.10)
I've really only tried two types of DIY room treatments, but what is best depends on what you're trying to accomplish. I have found that noodle lenses work well on the front wall (this could be becaus .......

146: Re: thanks for the replies; next question: (8.30)
Posted by Jon Risch on 2004-04-25, 21:22:13 (68.222.75.133)
These types of "absorbing material" panels will only tend to absorb the HF's, and a little of the upper mids, being only 5/8" thick. Thus they have a VERY limited usefullness. You REALLY want to have .......

147: Re: Attn: Jon Risch re: Tube Traps (8.29)
Posted by David Aiken on 2000-02-22, 23:31:50 (203.12.171.33)
Jon, I don't know if this would be another option for Gary but here in Australia you can also buy insulation batts made of wool - the same size and similar appearance to fibreglass batts. I don't know .......

148: If Bob24 is up to DIY, then see this post (8.29)
Posted by Jon Risch on 2020-02-29, 22:23:26 (74.188.144.105)
Without getting all bogged down with measurements and perhaps too specific with the treatments, you can achieve some pretty decent results with a basic overall approach, as outlined in the various aco .......

149: Re: time aligning tweeters/mids question (8.28)
Posted by Jon Risch on 2000-01-19, 14:58:33 (209.215.72.221)
I have found that the true acoustic center of most speakers, from woofers to mids to tweeters, end up being at the back of the magnet, centered on the back plate. The voice coil is usually centered on .......

150: Re: No excuse to not build Risch's acoustical treatments. (8.25)
Posted by Jon Risch on 1999-04-14, 20:57:50 (207.3.84.93)
The last four are not directly comparable, as the thickness is not the same as the wall panels. I assume you used the recommended minimum thickness of fiberglass of 6 1/2". RPG PRo Foam: $25.00 THICKN .......

151: Re: Acoustic panel questions... (8.25)
Posted by Jon Risch on 2004-11-27, 09:27:30 (68.222.113.46)
703 refers to a specific model of Owen's Corning high density semi-rigid fiberglass panels. 703 has approx. 3 lbs/cubic foot density, while for comparison, regular building grade fiberglass insulation .......

152: Re: Room Acoustic Questions (8.21)
Posted by Jon Risch on 2004-06-15, 22:00:38 (68.222.75.164)
Bass traps (at least the more linear ones) placed in the corners, will damp all room modes to some extent, and thus will smooth out your response in room, including your problem frequencies (which are .......

153: Re: jon risch acoustic panels ? about construction (8.21)
Posted by Jim Bookhard on 2000-07-20, 07:23:36 (63.39.202.46)
http://www.audioasylum.com/audio/tweaks/messages/15737.html http://members.xoom.com/Jon_Risch/a1.htm .......

154: Re: Help on Jon Risch's DIY roomlens clone (8.20)
Posted by Ed on 1999-08-10, 19:46:09 (131.101.1.200)
Hi Gary, Do you know where I can find info on Young's diffusion patterns? Can I find it from the Alton-Everest acoustic book? thanks, Ed .......

155: Re: where'd you learn all this crap? (8.20)
Posted by Jon Risch on 1999-04-23, 10:37:51 (207.3.84.23)
I have worked with almost all aspects of audio, both professionally, and as an enthusiast. I currently earn a living as a pro loudspeaker designer, and have not only the acoustic chops, but electronic .......

156: For the typical room size (8.20)
Posted by Jon Risch on 2006-09-21, 21:03:21 (70.152.108.160)
I would recommend absorption. This would apply to rooms up to about 15-18 feet wide by 25 to 30 feet deep. Larger rooms would probably benefit from a combination of absorption and diffusion, and some .......

157: Jon Risch Acoustic Treatment Question (8.19)
Posted by JohnL on 2003-06-08, 20:31:12 (65.35.255.55)
Hello Jon I am trying to make some sound absorber panels, but I am having trouble tracking down rock wool or rigid fiberglass. Would these Melamine Foam Sound Absorbing Ceiling Tiles from Mcmaster wor .......

158: Re: Initial impressions on using JR acoustic absorbtion panels (8.18)
Posted by Fred Rule on 2000-07-26, 09:37:56 (209.240.220.165)
Go to the FAQ section of the Asylum and scroll down to DIY.Jon Risch's website is linked there.Plus,on his site is info. on cables, ICs, and more.A great source of information! .......

159: Re: Side wall absorbers ala Risch (8.14)
Posted by Batman on 2003-02-18, 13:33:41 (128.147.183.144)
The short answer is no, you can't use acoustic tiles. They aren't thick enough or absorptive enough and will only absorb higher frequencies. They could actually make things worse (more boomy). The bes .......

160: Re: YES, do treat your room! One caution. (8.14)
Posted by Jon Risch on 2004-04-27, 22:10:44 (68.222.75.133)
Bass traps placed at the 1st reflection points are NOT necessarily the best place to absorb/damp room modes, and are not as wide as most of the effective wall panels. It is a compromise use and result .......

161: question for Gary Jacobson Re: Jon Risch's diy acoustic treatments......... (8.13)
Posted by Paul Tobin on 2000-08-28, 02:03:26 (203.54.49.62)
....Gary, or anyone, is burlap the same thing as hession? Is there a specific tightness(looseness) of weave necessary for acoustic transparency? I am collecting bits and pieces for JR's bass traps/pan .......

162: Re: Attn: Jon Risch re: Large Glass Doors (acoustic treatment) (8.13)
Posted by Gary Jacobson on 2000-03-08, 16:33:58 (203.37.199.13)
G'Day, Indeed, why not? I forgot to mention that the said door is already curtained with a medium weight fabric. Regards, Gary Jacobson .......

163: DIY Room Lens questions....Jon Risch or ?? (8.10)
Posted by Peter J on 2001-01-01, 14:57:56 (209.19.147.3)
So that I might fill my listening room with all manner of tweaks, and thus, drive myself further down the road towards the looney bin, I'm building a set of Room Lenses per Jon Risch recipe. As I put .......

164: Re: More acoustic treatment questions for Jon risch (8.09)
Posted by Jon Risch on 2001-08-20, 10:16:23 (209.215.72.176)
RE1 The OC panels can be ordered through any OC distributor, and the way to get them is to "piggy-back" an order along with the distrib's normal order, this way, you do not have to pay custom shipping .......

165: Nope. (8.07)
Posted by Jon Risch on 2000-06-06, 17:54:14 (209.215.72.186)
This method does not align the driver to be time aligned or time coherent. All it does is FOR A GIVEN SUM OF TOTAL PHASE SHIFTS, is to create a null with those particular drivers and that particular c .......

166: Re: diy bass traps (8.07)
Posted by Jon Risch on 2004-04-01, 17:17:55 (68.212.173.201)
See: The original DIY Acoustic Treatment Note: http://www.geocities.com/jonrisch/a1.htm the original post where I reveal the latest Quick & Dirty super easy bass traps recipe: http://www.audioasylum.c .......

167: Re: acoustic treatment (8.06)
Posted by Jeff Starr on 2003-04-15, 07:23:21 (64.158.96.160)
Hi, you might be better off going with some heavy drapes, that can be closed during listening sessions and building/buying some bass traps. You'll get the most benefit out of treatments, designed to c .......

168: RE: egg carton room treatment (8.01)
Posted by MikeWI on 2016-07-13, 12:39:29 (99.88.166.165)
Look up Jon Risch's DIY designs. Very effective and much less expensive than retail options. I found room acoustic treatments to be, by far, the largest magnitude tweak for better sound. Mike ::: TOPI .......

169: Re: fiberglass or foam? Quality of foam? For DIY room treatment. (8.01)
Posted by Jon Risch on 2000-12-14, 10:48:30 (209.215.72.169)
Proper Acoustic foam will absorb HF's just as well as fiberglass, but bedding foams, packing faoms, etc, are of unknown quality, and will often reflect HF's to some extent. Fiberglass covered with opl .......

170: Re: look at my room!! what kind of room treatments could i possibly implement? :-\ (7.99)
Posted by Jon Risch on 2003-06-08, 17:02:50 (68.154.136.129)
In a room that small, with so little open space available, there is not a whole lot to be done, BUT..... There are some things you can do. One is to provide some absorption behind your head on the wa .......

171: Small room acoustic treatment – is it possible? (7.98)
Posted by vladco on 2012-11-30, 20:19:03 (67.164.184.105)
I read a lot on the net and get overwhelmed with information. I've got small bedroom 12' (10' without closet) by 9' by 8' . I could do almost every thing I want with it. Is it possible to treat it to .......

172: Re: X-over probs & questions - 2nd round (7.97)
Posted by Jon Risch on 2003-10-30, 20:18:25 (68.154.141.156)
[ Is it (sonically) OK to mix a Buttorworth filter with a Linkwitz-Riley filter in a X-over? ] Sure, as noted, it is the TOTAL net result that counts, and if these two electrical filters interact with .......

173: RE: Jon Risch Website (?): bass traps and acoustic panels (7.95)
Posted by Ethan Winer on 2009-11-09, 08:07:13 (24.151.106.185)
> what's the difference between the Corning 703 and 705 rigid fiberglass panels, as far as efficacy. See this article: Density Report --Ethan .......

174: Look at the other end (7.93)
Posted by Jon Risch on 2004-11-02, 18:51:54 (68.222.64.140)
Instead of trying to change the amp, which is not likely to work without serious risk of catrastrophe, why not look at the other end, the speaker? The major effect of a high dampiong factor, is beter .......

175: Risch bass traps done!! (7.91)
Posted by newsjeff on 2004-05-06, 15:51:09 (216.54.96.140)
I just finished two Jon Risch DIY bass traps. I used his original design based on the ASC traps. First, let me say what a difference putting these four-foot, 16" traps in the back corners made in my r .......

176: Re: Does "egg crate" foam have any use as a acoustic treatment? (7.89)
Posted by R. Hertz on 2000-08-10, 14:37:41 (24.30.136.32)
I seem to recall in one of Jon Risch's articles about room treatments that eggcrate mattress foam doesn't work all that well. The convolutions aren't deep enough and as a result it reflects more than .......

177: Re: What does a NRC greater than 1 mean? (7.88)
Posted by Jon Risch on 2001-06-06, 18:59:35 (209.215.72.160)
[ When looking at acoustic foams, I often see NRC values that are greater than 1.0. If 1.0 means complete absorbsion at a given frequency, then what does a value >1.0 mean? ] It means the test procedu .......

178: Re: What a mess! (1/3 octave readings with a RS SPL meter) (7.87)
Posted by Jon Risch on 2002-09-03, 19:04:43 (209.215.72.226)
Sound Level Meters, even with correction curves, can be somwhat misleading under the best of circumstances. You used continuous sine wave tones, and these are doubly misleading, due to build-up of sta .......

179: Re: Room Treatment and absorptive properties of foam blades (7.86)
Posted by Jon Risch on 2001-05-26, 11:28:47 (209.215.72.171)
OK. The reflecting points should have a wide band capability because if all they do is absorb the HF's, the reflection will still be there in the lower mids and LF's. This will still muddy the stereo .......

180: Re: Need advice in DIY absorbing panel (7.84)
Posted by Wlad on 2005-10-31, 12:15:41 (80.74.160.9)
Thanks everyone, >> Jon Risch yes, it's clearer to me now. However I find it much easier to build an acoustic panel basing it on semi-rigid boards... >> troporobo it's great thinking ! (I had some ide .......

181: Re: Thanks for the advice...I did a little experiment ;-) (7.77)
Posted by Jon Risch on 2004-11-09, 10:01:37 (65.12.40.103)
Be sure to see my comments in this post: http://www.AudioAsylum.com/audio/tweaks/messages/17541.html Note also the suggestions about keeping the area around the speakers free from excess objects. Dips .......

182: Re: Room Acoustics Experts (7.76)
Posted by Jon Risch on 2001-08-15, 22:15:38 (209.215.72.173)
Most rooms with 'normal/typical' spouse inspired decor are not over damped. Hence, they need some additional treatment. One of the most common mistakes when attempting to treat a room, is to use mater .......

183: Acoustic question for Jon Risch (7.73)
Posted by joe on 2000-03-31, 17:37:18 (205.188.196.33)
Your tube traps and wall panels have dramatically improved my listening room! Thanks. Do you know what the effect of a Da Lite Screen ( 100 " diagonal ) on a fixed metal frame and hung fom the ceiling .......

184: Re: fiberglass ceiling tiles (7.65)
Posted by Jon Risch on 2004-04-19, 18:03:22 (68.19.132.205)
Will it work is a relative thing. You can hang a washcloth ont he wall, and it WILL absorb some sound. Just not a useful amount. The problem with ceiling tiles (fiberglass or other wise), is that they .......

185: Re: Who is Jon Risch? (7.61)
Posted by Jazzbo8 on 1999-05-31, 11:24:08 (216.102.199.14)
Thanks again for the clarification, it is always good to know where the person came from, so we can calibrate his/her comments. I too have an EE background, but have very limited knowledge on acoustic .......

186: There's a lot to do, grasshopper (7.59)
Posted by badman on 2003-09-17, 10:27:12 (67.85.218.36)
I'd start with playing around with how the speakers are arranged within the room, then add acoustic treatments. Do a search in here for Jon Risch Bass Traps, and you'll come up with some nifty and hel .......

187: WAF-can 703/705 fiberglass panel replace 6" deep Risch Acoustic panels (7.59)
Posted by Carl G on 2005-05-02, 13:28:06 (68.5.140.225)
Just got married. A request has been made to see if we can eliminate the 6ft x 4ft "mattresses" (6" thick)that are on the right and left reflection points in the living room. I have full windows on th .......

188: Re: bass trap/sound panel? (help Jon Risch) (7.58)
Posted by Jon Risch on 2004-12-02, 20:59:36 (68.19.136.1)
Definitely use the 3" fiberglass. Is the egg crate foam an acoustical grade, or just some foam you found, or is it bedding grade foam, like from Wally World? Unless it is known to have good acoustical .......

189: Re: 4ft X 8ft DIY WALL panel : Jon Any comment ? (7.57)
Posted by Jon Risch on 2005-11-06, 19:11:12 (68.222.71.33)
No cloth, no absobing material is perfectly absorptive at all frequencies, they all reflect something at some frequency. This is true of the fabrics covreing the primary sound absorbing material, and .......

190: Re: Slap Echo, Acoustic Foam, Thickness (7.56)
Posted by Jon Risch on 2003-03-15, 08:37:24 (67.248.245.153)
If you treat just the slap echo, you could end up with a tonal imbalance. The number one biggest mistake that folks do when acoustically treating a room, is to use too thin of a material, and then use .......

191: Re: acoustic treatment (7.55)
Posted by Steve on 2001-04-01, 16:33:06 (192.6.76.72)
I've used both the Jon Risch DIY panels and the Echo Buster panels and have been pleased with the performance of both. A 24" panel will do a better job of managing the sidewall reflection. One advanta .......

192: Re: Question for Jon Risch re: acoustic panels (7.55)
Posted by Jon Risch on 2007-02-04, 19:31:00 (68.19.136.132)
Using the 2" thick OC 703, I would use at least three panels for a wall panel frame, for a total thicknes of 6", with a layer of polyester batting on the front. However, I also recommend a wall panel .......

193: Post at the Rives forum (7.54)
Posted by newsjeff on 2004-04-01, 15:10:39 (216.54.96.140)
Also, try some Jon Risch acoustic treatments. .......

194: wich are more effective panels or roomlens (7.52)
Posted by mike slater on 2000-01-29, 04:16:48 (209.240.200.85)
last week i built 7 of jon risch's acoustic panels.they seem to help my room alot.i was planning on building a couple of bass traps...but i started reading about roomlens....wich work better???..i don .......

195: RE: Holes on the frame regarding to DIY acoustic panel (7.51)
Posted by Jon Risch on 2008-02-13, 18:32:32 (65.12.40.83)
Tom, Drilling holes in the side will not add substantially to the overall absorption of sound, as the amount of absorber area this entails is not a large percentage of the total surface. A more seriou .......

196: Re: Can one tweak too much? (7.50)
Posted by David Aiken on 1999-08-06, 14:52:05 (203.12.171.18)
Jack G is right, you can overdamp a room, but what you're more likely to do is to overdamp it within certain frequency ranges. Carpet and soft furnishings, for example, don't absorb evenly over the wh .......

197: Re: Variation on Jon Risch DIY bass trap -- opinions? (7.48)
Posted by Randy Bey on 2001-05-04, 08:18:09 (63.226.185.181)
Might not need bass traps, maybe acoustic panels would do the trick. Do this: with bass heavy music playing, walk around the room, particularly in the corners, moving slowly, an inch at a time, in the .......

198: Re: Not So, just need to do it right (7.46)
Posted by Jon Risch on 2000-02-29, 17:48:21 (209.215.72.225)
I am aware that my knowledge base is not all encompassing, but the thread is about getting OC 705 semi-rigid panels. Yes, OC makes other panels THAT THEY SELL IN THE MANNER YOU DESCRIBE. Perhaps you a .......

199: RE: Diffusion (7.44)
Posted by David Aiken on 2008-11-09, 23:08:51 (121.222.212.135)
The quick and dirty bass trap approach works quite well and is one approach that you can consider. I've attached a link to Jon Risch's acooustic DIY pages below. There are a number of other ways of bu .......

200: Re: DIY acoustic panels (7.39)
Posted by Jon Risch on 2004-11-08, 10:09:39 (68.19.133.98)
For the wall panel that is placed in an open spot, yes, put some drywall or plywood on the back, but be sure to leave some air space between it and the fiberglass! This may require additional framing .......

Found total of 200 records, Query: Jon +Risch +acoustic in Tweakers' Asylum, Time: 1 sec.

Searches are limited to a maximum of 200 records. Your query returned too many records. Try limiting your search by using the Advanced Search Options below to select an author, a date range, a single forum or more specific search terms.

New Search