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1: Planar Speaker Asylum, RE: External Crossovers Tympani IVa (0.00)
Posted by mikebarney on 2023-04-30, 04:39:33 (24.184.225.216)
For anyone considering these, please note that these are NOT T-IVa crossovers, but T-IV. They are in fact different, link to schematics attached. Mike .......
2: Planar Speaker Asylum, RE: tympani IVa owners- a question (0.00)
Posted by mikebarney on 2022-04-12, 10:08:48 (24.184.225.216)
Just to clarify: Your question implied you wanted to run the mid/tweeter panel full range: "(I assume their crossover is internal)". This is only partially correct. The mid/tweeter panel contains the .......
3: Planar Speaker Asylum, Tympani IVa refurb project completed (0.00)
Posted by mikebarney on 2021-07-01, 04:33:39 (24.184.225.216)
I bought a pair of Tympani IVa's earlier this year that had recently been rebuilt at the factory. I've made a few additional modifications (terminal, fuses, crossover caps) documented on this webpa .......
4: Planar Speaker Asylum, RE: Tympani IV to IVa changes (0.00)
Posted by mikebarney on 2021-06-29, 19:00:31 (24.184.225.216)
Attached is the press release from Magnepan detailing the differences. Not mentioned, but the IVa has the oaks side rails as well. Mike .......
5: Planar Speaker Asylum, Solved: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-26, 05:48:47 (24.184.225.216)
Recap: One of my midrange drivers had lower output than the other channel, by 3 or 4 dB across its range. I determined the problem was an excessive bend in the perforated back panel of the driver ( .......
6: Planar Speaker Asylum, RE: Progress report: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-11, 12:44:59 (24.184.225.216)
Progress Report: I've confirmed that reducing the bow of the midrange back panel clearly increases the output, so thats the problem that needs to be solved. Methodology: I built a stand to hold the .......
7: Planar Speaker Asylum, RE: "cross bars at 2 or 3 locations to the rear of the panel" ... (0.00)
Posted by mikebarney on 2021-04-11, 05:56:28 (24.184.225.216)
Andy- I'll experiment with the number of braces. Aluminum is usually my choice when doing metal work, as it's easier to machine. As a side benefit, it's not magnetic. Mike .......
8: Planar Speaker Asylum, RE: Shirley the pole piece *needs* to be bowed ... (0.00)
Posted by mikebarney on 2021-04-10, 05:33:52 (24.184.225.216)
I'm not so sure the panel needs to be bowed (notwithstanding the fact that Magnepan says a small bow is normal). The woofer panels are much wider, and they have little or no bow, and surely the woofer .......
9: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-10, 05:30:51 (24.184.225.216)
Roger- Since my mids were recently rebuilt at the factory, I'm planning on another approach (that doesn't require replacing or re-wiring the mylar) to move the magnet/perforated panel closer to the my .......
10: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-09, 06:02:52 (24.184.225.216)
Roger- Thanks for the photo, very helpful. I just heard back from Gary at Magnepan, and he indicated a slight bow (about 1/8") was typical. Mine is over twice that, so I plan to do some measurements .......
11: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-08, 14:06:04 (24.184.225.216)
Roger- Thanks, I've written to Gary at Magnepan. I'm thinking even if the mid panels normally have some warp to them, that this example may be a bit extreme. My other channel (with the higher output) .......
12: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-08, 09:08:01 (24.184.225.216)
New data point: I removed the ribbon and the grille to inspect the mid panel. I found that the perforated metal backer panel of the midrange, to which the magnets are mounted, is bowed away from th .......
13: Planar Speaker Asylum, RE: "I've managed to avoid having to re-wire a panel this far" ... (0.00)
Posted by mikebarney on 2021-04-07, 19:36:43 (24.184.225.216)
Andy- I'll ask, but I've heard they'll only use the foil on speakers originally designed using it. Thanks, Mike .......
14: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-07, 17:05:06 (24.184.225.216)
Thanks for your note. You are correct, that all upstream components have been ruled out. I checked my original TIVa schematic from years ago, and although the online copy is difficult to read, I belie .......
15: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-07, 16:49:56 (24.184.225.216)
Steve- Thanks for you suggestions, all those diagnostics have been done. Definitely not upstream, the FR measurements were in fact made from the same amplifier channel, same source, etc. The problem i .......
16: Planar Speaker Asylum, RE: Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-07, 16:48:37 (24.184.225.216)
Andy- Thanks for your note. Your suggestion is, unfortunately, exactly what I fear the problem may be - some error in re-furbishing the midrange at the factory. My next step is to dis-robe the good pa .......
17: Planar Speaker Asylum, Help needed: Tympani IVa midrange driver problem (0.00)
Posted by mikebarney on 2021-04-07, 12:50:52 (24.184.225.216)
I recently purchased a pair of Tympani IVa speakers, still in their factory sealed cartons after a complete rebuild at Magnepan last year. I've been having a problem getting centered images between .......
18: Planar Speaker Asylum, RE: Crossover upgrade for Tympani IVa (0.00)
Posted by mikebarney on 2021-02-23, 05:56:01 (24.184.225.216)
Andy- I'm building new crossovers for the Tympani IVa's. The images you posted above are too small to be completely legible. Could you post the crossover schematics in larger format? Thanks, Mike ::: .......
19: Vintage Asylum, RE: Technical SO 10 mk2- small click noise heard at each revolution at all three speeds? (0.00)
Posted by mikebarney on 2019-09-14, 08:23:36 (24.185.66.0)
I had a similar problem. Mine was caused by the damping material (glued to the bottom of the platter) starting to come loose at one edge, drooping down and touching the motor below each revolution. Th .......
20: Tweakers' Asylum, RE: bobwire and the SDS-470-Redux (0.00)
Posted by mikebarney on 2018-03-26, 10:45:15 (69.124.73.251)
Are these bypass caps on the IRS2092 IC? Could you tell us the pin numbers? Also, I have an SDS-254, and the PCB looks very similar. Do you know if anyone has tried this mod with that amp board? Thank .......
21: Computer Audio Asylum, RE: Mac mini setup....external thunderbolt storage? (0.00)
Posted by mikebarney on 2013-06-05, 14:19:35 (68.193.39.112)
I use a similar setup (late 2009 Mac Mini, SSD for the OS, 8G RAM), but I replaced the CD drive with a sled and 1Tb spinning SATA drive for the music library. Nice clean setup. I have a couple 1TB por .......
22: Computer Audio Asylum, RE: Anyone using a Mac Mini as a server? (0.00)
Posted by mikebarney on 2012-09-10, 14:12:11 (68.193.38.133)
I also use a late 2009 Mac Mini - available used pretty inexpensively. But I'm now using it as a Windows machine. I upgraded RAM to 8G (not all used by Windows) and changed boot drive to 60G SSD. I re .......
23: Computer Audio Asylum, RE: dsd over pcm? (0.00)
Posted by mikebarney on 2012-09-04, 03:52:03 (68.193.38.133)
Charles- Will existing QB-9s be able to be upgraded with DoP 1.1 (DSD over PCM) support? If so, any idea of price? Thanks, Mike .......
24: Computer Audio Asylum, RE: 2011 comp based server ? (0.00)
Posted by mikebarney on 2011-08-03, 12:17:17 (67.87.12.254)
Computeraudiophile.com recently published their most recent server design. Link below .......
25: General Asylum, RE: Hour meter for components? (0.00)
Posted by mikebarney on 2010-05-03, 18:51:50 (67.87.12.254)
The unit keeps the running hour count when the amp is powered down. It can easily be reset (e.g. when you change output tubes) as described on my webpage by momentarily shorting two pins together. Mik .......
26: General Asylum, RE: Hour meter for components? (0.00)
Posted by mikebarney on 2010-05-03, 04:01:12 (67.87.12.254)
Here's a low power, quiet (mechanical ones are sometimes very noisey)hour meter I added to an Audio Research amp, with photos and installation details: Mike .......
27: Tubes Asylum, RE: Audio Research D-115 fuses value (0.00)
Posted by mikebarney on 2009-12-26, 06:04:46 (67.87.12.254)
The schematics are available at the link below. The AC "Line" fuse is 6.25A MDX (slow blow) for 120V units, or 3.2A MDA for 240V units. The "Screen" fuse is a 1Amp 3AB fuse (fast blow). My older manua .......
28: Tubes Asylum, Audio Research ST-70-C3 info (0.00)
Posted by mikebarney on 2009-03-19, 16:26:22 (67.87.12.254)
That schematic and lots more info on the ST-70-C3, including recommended upgrades by Bill Johnson (founder of ARC) from 2004 are included on my webpage, link below. Mike .......
29: Computer Audio Asylum, RE: Anyone using MSI Wind PC as music server? (0.00)
Posted by mikebarney on 2008-12-19, 11:20:39 (67.87.12.254)
Thanks for the link. I was actually planning on using a 2.5" hard drive, as I need more space than the SSDs seem to be able to provide, plus a hard drive is MUCH cheaper (and things seem to change pre .......
30: Computer Audio Asylum, RE: Where do you get one for only $130 ? (0.00)
Posted by mikebarney on 2008-12-19, 06:33:00 (67.87.12.254)
The MSI Wind is $130 at Newegg. Keep in mind that its a barebones PC, still needs RAM and hard drive as well an OS. Mike .......
31: Computer Audio Asylum, Anyone using MSI Wind PC as music server? (0.00)
Posted by mikebarney on 2008-12-18, 12:50:32 (67.87.12.254)
These small low power PCs seem like a good basis for building a dedicated music server. I'll add a CD drive for ripping and a 320G 2.5" laptop drive for both the OS and my FLAC library. Its cheap - on .......
32: Computer Audio Asylum, ...why no Dell laptops? (0.00)
Posted by mikebarney on 2008-11-08, 14:45:04 (67.87.12.254)
Steve- Can you elaborate on why you suggest avoiding Dell brand laptops? Thanks, Mike .......
33: Computer Audio Asylum, Connecting 2 USB DACs in Windows XP? (0.00)
Posted by mikebarney on 2008-09-15, 18:02:39 (67.87.12.254)
I would like to connect two USB DACs to my Windows XP music server - one for my inexpensive system for non-critical listening, and a second USB DAC that feeds my main stereo system for more critical l .......
34: Radio Road, Day-Sequerra Info webpage completed (0.00)
Posted by mikebarney on 2008-04-02, 11:46:41 (67.87.12.254)
I've been gathering up information on the early Day-Sequerra tuners, in all their variations, and assembled it into a webpage, link below. This is basically an extension of my webpage on the origin .......
35: Speaker Asylum, RE: Fried Model B amd B2 (0.00)
Posted by mikebarney on 2007-12-16, 04:32:27 (67.87.12.254)
I don't mean to rain on your B2 quest, but you should worry much less about the woodworking and more about the driver. By changing drivers, which will have different frequency response, impedance curv .......
36: Speaker Asylum, RE: Fried Model B amd B2 (0.00)
Posted by mikebarney on 2007-12-14, 08:35:29 (67.87.12.254)
Yes, one of Fried's selling points was upgradability. However, both drivers get swapped out along with some crossover changes. The sticking point will be that none of the drivers in the B/2 are rea .......
37: Radio Road, Sequerra tuner webpage completed (0.00)
Posted by mikebarney on 2007-12-10, 14:55:54 (67.87.12.254)
I've been collecting information on the Sequerra Model 1 FM tuner for many years. I've recently collected it all into electronic format and created a webpage of reference material for those interes .......
38: Vintage Asylum, Audio Research SP-3 preamp upgrade project completed (0.00)
Posted by mikebarney on 2007-05-23, 18:53:33 (67.87.12.254)
I recently completed an upgrade to an Audio Research SP-3. I documented the process with lots of photos and SP-3 links, use the link below. Mike .......
39: Tubes Asylum, I've always found Leonard very helpful (0.00)
Posted by mikebarney on 2003-06-01, 16:45:18 (67.87.7.69)
I have owned many pieces of ARC equiment over the years, much of it bought second hand - not from an ARC dealer. I've spoken with Leonard many, many times over the past 20 years for repairs, spare par .......
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