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1: High Efficiency Speaker Asylum, RE: how to centralize a we555 compression driver (0.00)
Posted by Jmmlc on 2013-05-13, 03:07:10 (194.214.158.222)
Hello, Here is my view on that question. Inversely to the common idea that with Western Electric drivers you just have to screw the diaphragm and it will operate always at his best, this is not true. .......
2: High Efficiency Speaker Asylum, RE: are "1st" order networks necessary to get good squarewave from coaxial wooofer/tweeter?/? (0.00)
Posted by Jmmlc on 2013-04-03, 00:49:47 (194.214.158.221)
Hello, A problem with the first order network is that the loudspeakers are not operating in phase but in quadrature as there is at any frequency a difference of phase of 90° between the wave emitted b .......
3: High Efficiency Speaker Asylum, RE: Field coil vs permanent magnet -Fundamental differences besides the obvious? (0.00)
Posted by Jmmlc on 2012-10-04, 08:13:13 (194.214.158.221)
Hello, Not measurements but BEM simulations performed by Bjorn Kolbrek which has been proven in several cases to be accurate compared to real measurements: http://kolbrek.hoyttalerdesign.no/index.php/ .......
4: High Efficiency Speaker Asylum, RE: What Sansui test their trans on! (0.00)
Posted by Jmmlc on 2012-06-07, 03:14:28 (194.214.158.222)
Hello, Not about the 31A but others WE horns : http://forums.melaudia.net/attachment.php?aid=1671 Best regards from Paris, France Jean-Michel Le Cléac'h .......
5: High Efficiency Speaker Asylum, RE: I believed it is very very very very important.. (0.00)
Posted by Jmmlc on 2012-03-06, 23:48:16 (194.214.158.222)
Hello cids, The owner of that system was the importer of BSS here in France. From memory he used 2 or 3 x FDS388 Omnidrive in that system. Best regards from Paris, France Jean-Michel Le Cléac'h ::: T .......
6: High Efficiency Speaker Asylum, RE: Altec 288C with Azura horns verses conical horns (0.00)
Posted by Jmmlc on 2011-09-19, 04:50:46 (194.214.158.222)
Hello, I used to say what I think about conical horns in the threads: http://www.audioasylum.com/forums/hug/messages/15/152678.html http://www.audioasylum.com/forums/hug/messages/14/140824.html http:/ .......
7: High Efficiency Speaker Asylum, RE: Altec 288C with Azura horns (0.00)
Posted by Jmmlc on 2011-09-16, 00:48:03 (193.251.63.39)
Hello, The Le Cléac'h horn is not a modified tractrix. The tractrix design is based on the propagation of spherical wavefrontss. Such is also the Kugelwellen horn. But no "a priori" hypothesis is made .......
8: High Efficiency Speaker Asylum, RE: The link does not work. (fixed?) (0.00)
Posted by Jmmlc on 2011-04-28, 00:26:14 (194.214.158.221)
Hello claudej, You are right, the Klipschorn is missing because I choose the Lansing Hartsfield to illustrate that type of folded bass horn (page 51 of the document). Why I choose the Hartsfield? For .......
9: High Efficiency Speaker Asylum, RE: pdf document of my conference on horns given at ETF2010 (0.00)
Posted by Jmmlc on 2011-04-27, 02:11:13 (194.214.158.221)
Hello Tom, For sure a lot of modern horns type is missing from my conf which is more devoted to horns and waveguides having aquired some fame through time. I have also to confess that I never listened .......
10: High Efficiency Speaker Asylum, RE: pdf document of my conference on horns given at ETF2010 (0.00)
Posted by Jmmlc on 2011-04-27, 00:04:44 (194.214.158.222)
Hello Inmate51, Sorry I am not that one. The job for which I am paid has never been related to audio. Best regards, Jean-Michel Le Cléac'h .......
11: High Efficiency Speaker Asylum, RE: The link does not work. (fixed?) (0.00)
Posted by Jmmlc on 2011-04-26, 06:49:39 (194.214.158.222)
Hello, Should work now! Thanks for the info. Best regards from Paris, France Jean-Michel Le CLéac'h .......
12: High Efficiency Speaker Asylum, pdf document of my conference on horns given at ETF2010 (0.00)
Posted by Jmmlc on 2011-04-26, 05:54:13 (194.214.158.222)
Hello, The pdf version (Acrobat) of the document corresponding to the illustrations of the conference I gave in december at ETF'2010 about horns is downloadable until May 3rd at: https://filex.mines-p .......
13: High Efficiency Speaker Asylum, RE: The 4001 has too many anomalies in the highest frequencies (0.00)
Posted by Jmmlc on 2011-04-19, 00:42:55 (194.214.158.221)
Hello, You are perfectly right, while both TD4001 and TD2001 TAD compression drivers are top class, the large 10cm diaphragm of the TD4001 is more problematic at high frequency than the 48mm diapragm .......
14: High Efficiency Speaker Asylum, RE: A question about autoformers with compresison drivers (0.00)
Posted by Jmmlc on 2011-03-10, 07:12:04 (194.214.158.221)
Hello, There is not always a need to have a very low impedance source to drive compression, drivers. With excellent drivers like the TD2001 a high series impedance is beneficial. Either a linearizati .......
15: High Efficiency Speaker Asylum, RE: Best way to attenuate horns : resitstors or autoformers? (0.00)
Posted by Jmmlc on 2011-03-10, 00:12:39 (194.214.158.221)
Hello KanedaK, thanks for the info about that autransfo pad: I don't know if some kind of selector can be added in order to make it variable though. Best regards from Paris, France Jean-Michel Le CLéa .......
16: High Efficiency Speaker Asylum, RE: Best way to attenuate horns : resitstors or autoformers? (0.00)
Posted by Jmmlc on 2011-03-09, 02:53:25 (194.214.158.221)
Hello Dave, Your argument is good when it comes to the source impedance as seen by the loudspeaker. Now let's look at the load impedance seen by the crossover. With a resistive L pad we can achieve a .......
17: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-15, 01:20:29 (194.214.158.221)
Hello Jonathan, I used to put at the same scale the frequency response curve you measured yourself using TEF on the couple RCA1428 + AH300 http://oswaldsmillaudio.com/forum2/index.php?PHPSESSID=34g6n .......
18: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-14, 09:23:25 (194.214.158.221)
Hello, I wrote in a prevous message that the choice or not of a constant directivity is directly in relation with each one preference in term of listening conditions. I have probably to go deeper in t .......
19: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-14, 00:33:44 (194.214.158.221)
Jonathan, When one doesn't like the results of published measurements he attacks the method used and the one who performed the measurement. I am acustomed to such old trick and I guess you know that, .......
20: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-13, 01:37:13 (194.214.158.221)
Hello Thomas, I surely would not say that the Klangfilm is not detailed. As you said the sound it delivered was one of the most detailed. But to add to the discussion, there were at ETF horns + driver .......
21: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-13, 00:38:07 (194.214.158.221)
Hello Jonathan, Your graph shows ETC curves and doesn't show what is the actual impulse responses. When I saw the results I obtained at ETF, and specially the H2,H2, H4 and H5 curves of the RCA driver .......
22: High Efficiency Speaker Asylum, RE: That is a good question (0.00)
Posted by Jmmlc on 2010-12-10, 07:56:24 (194.214.158.221)
Hello, I tend to disagree. Here again personnal preferences conditions the choice, not psychoacoustics. The best "monitor type" listening one can do is with loudspeakers whose directivity increases .......
23: High Efficiency Speaker Asylum, RE: horns that where selected as best (0.00)
Posted by Jmmlc on 2010-12-10, 05:56:13 (194.214.158.221)
Hello, There cannot be any generalization on that subject as it is related to personnal preference on how people perform their listening. e.g.: if you listen always alone at the same sweetspot (as me .......
24: High Efficiency Speaker Asylum, RE: horns that where selected as best (0.00)
Posted by Jmmlc on 2010-12-09, 01:03:23 (194.214.158.221)
Hello, I don't understand your 2 sentences... Please will you use a more comprehensible language with me (I am French and the subtilities of your English pass over my head). Best regards from Paris, F .......
25: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-08, 09:00:36 (194.214.158.221)
Hello Dave, By the past, I used several times to listen with great satisfaction to Klangfilm systems using that square horn, with a field coil driver or with the alnico driver and I used to prefer the .......
26: High Efficiency Speaker Asylum, RE: I didn't select any horn myself (0.00)
Posted by Jmmlc on 2010-12-08, 08:08:13 (194.214.158.221)
Hello, For your information: I didn't select any of those horns and none belongs to me. Nor I was member of the ETF2010 organizing comitee or organizer of the "horns shoot out" (even if I am a friend .......
27: High Efficiency Speaker Asylum, RE: 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-08, 07:49:32 (194.214.158.221)
Hello, Here what I used to reply on another place: It will be very presumptuous of me to say I know why the old Klangfilms square horns won the "shoot-out" at ETF2010. But I may try to throw few hypot .......
28: High Efficiency Speaker Asylum, RE: Quel travail! (0.00)
Posted by Jmmlc on 2010-12-08, 05:37:56 (194.214.158.221)
Hello Vince, Regardes au bas de la page 2 du rapport. Due to some technical problem encountered by the organizers of ETF2010 during the preparation of the "shoot-out", I had to delay my own measuremen .......
29: High Efficiency Speaker Asylum, 16 horns measurements (0.00)
Posted by Jmmlc on 2010-12-07, 01:50:12 (194.214.158.221)
Hello, The "shoot out" of the European Triode Festival 2010 (ETF2010) was devoted to horns and waveguides. 16 horns were brought by participants to ETF2010 for the contest. Aside of the official shoot .......
30: High Efficiency Speaker Asylum, RE: I sure miss posts by Paul Butterfield (0.00)
Posted by Jmmlc on 2010-11-02, 08:01:34 (194.214.158.221)
Hello Tom, Next time you'll see Paul, please would you transmit to him my best regards. Best regards from Paris, France Jean-Michel Le Cléac'h .......
31: High Efficiency Speaker Asylum, RE: checking in with Melaudia (0.00)
Posted by Jmmlc on 2010-07-05, 04:37:45 (194.214.158.221)
Hello squiffles, Melaudia (Mélomanes et audiophiles assocoés) is a French association of music and sound lovers (of which I am member). We organize meetings to audition audio gear (4 per years), confe .......
32: High Efficiency Speaker Asylum, RE: Very impressive and a circutious connection (0.00)
Posted by Jmmlc on 2010-07-05, 02:35:58 (194.214.158.221)
Hello plantsman, Saint Cast is a small harbour in Brittany named after an obscure local saint. Saint-Castin is a small town in the Pyreneans mountains. The etymology of the name is unknown. The life o .......
33: High Efficiency Speaker Asylum, RE: La Grande Castine (0.00)
Posted by Jmmlc on 2010-07-02, 00:07:22 (194.214.158.221)
Hello Angelo, I used to discuss tweeters with Marco Henry and even I wrote for him a spreadsheet to calculate horns having center ogive to be used with ring tweeter or eventually with a 1" driver the .......
34: High Efficiency Speaker Asylum, RE: La Grande Castine (0.00)
Posted by Jmmlc on 2010-07-01, 23:48:23 (194.214.158.221)
Hello Vince, Please Note that I am not the Jean-Michel, first name who comes often in the text written by Sarjan Ebaen. The person indicated by Sarjan is Jean-Michel Maumont to which I am in no way re .......
35: High Efficiency Speaker Asylum, RE: La Grande Castine (0.00)
Posted by Jmmlc on 2010-07-01, 09:07:32 (194.214.158.221)
Hello Peter, According to Marco Henry, all the compression drivers have been tweaked. Holes drilled here and there, felt used, some parts electrically bound to ground and a small drop of special varni .......
36: High Efficiency Speaker Asylum, La Grande Castine (0.00)
Posted by Jmmlc on 2010-07-01, 00:48:49 (194.214.158.221)
Hello, My friend Marco Henry was the first builder of Le Cléac'h horns. It begun to make them for the DIY crowd in 1998 and sold them under the label "Musique Concrète". Since few years he was develop .......
37: High Efficiency Speaker Asylum, RE: a spectrogram added to Hornresp (0.00)
Posted by Jmmlc on 2010-06-22, 05:37:18 (194.214.158.221)
Hello, The spectrogram in Hornresp has just been improved. The new calculation runs faster and the quality of the spectrogram is much better due to the use of a new Fourier window equivalent to a gaus .......
38: High Efficiency Speaker Asylum, a spectrogram added to Hornresp (0.00)
Posted by Jmmlc on 2010-06-15, 01:43:37 (194.214.158.221)
Hello, On the forum Diyaudio, in the Hornresp thread: http://www.diyaudio.com/forums/subwoofers/119854-hornresp-109.html#post2167471 I proposed to write for the Hornresp software a spectrogram routine .......
39: High Efficiency Speaker Asylum, RE: What's the theory behind adding a series resistor for more bass? (0.00)
Posted by Jmmlc on 2010-05-28, 09:21:30 (194.214.158.221)
Hello, Nelson Pass did a very interesting study about low Qts loudspeakers driven by a current source amplifier and using an optimized parallel RLC network. This study may be useful too when consideri .......
40: High Efficiency Speaker Asylum, RE: fostex FE103e, easiest way to increase bass response, etc (0.00)
Posted by Jmmlc on 2010-02-04, 03:27:40 (194.214.158.221)
Hello, I used to experiment with the FE103(sigma). One of my experiment was with a closed box of 86 liters. The 70Hz was at -12dB compared to the level in the range 500Hz-1000Hz. Then I tried a series .......
41: SET Asylum, RE: Measurement of 30 output transformers for SE300B (0.00)
Posted by Jmmlc on 2010-01-04, 09:45:26 (194.214.158.221)
Hello Dave, Paul reply is correct for the most, IMHO. The gap of the OPTs having a dominant 2nd order distortion component operates near the knee (in the low linearity part near the saturation) of th .......
42: SET Asylum, RE: Measurement of 30 output transformers for SE300B (0.00)
Posted by Jmmlc on 2009-12-15, 02:11:57 (194.214.158.221)
Hello Paul The loudspeaker used for the shoot-out of OPTs at ETF2009 is a replica of Shindo's Latour: http://www.shindo-laboratory.co.jp/English/speaker.html Its efficiency is given as 100dB/1W/1m. Ma .......
43: SET Asylum, RE: As interesting as I thought the whole test would be (0.00)
Posted by Jmmlc on 2009-12-15, 01:55:56 (194.214.158.221)
Hello, The frequency response of a SE 300B amplifer based on the WE91 schematic is highly dependant on the output transformer. I see no reason why the schematic in itself (WE310 + WE300B) apart the OP .......
44: SET Asylum, Measurement of 30 output transformers for SE300B (0.00)
Posted by Jmmlc on 2009-12-11, 07:03:49 (194.214.158.221)
Hello, During the last European Triode Festival, aside the "transformers shootout" , I could perform measurements on 30 output transformers for Single End 300B amplifiers. The document with the measur .......
45: High Efficiency Speaker Asylum, RE: Janus50 Ruban (0.00)
Posted by Jmmlc on 2009-12-09, 23:55:39 (194.214.158.221)
Hello, You are right. Anybody having some knowledge about how the diaphragm of the Linaeum tweeter and the Janus 50 behave (let us imagine the complete membrane acting entirely as a double "half roll" .......
46: High Efficiency Speaker Asylum, RE: Janus50 Ruban (0.00)
Posted by Jmmlc on 2009-12-09, 04:04:14 (194.214.158.221)
Hello Angelo, Few months ago I could listen both the Janus 50 from M. Deminière and the Rubanoides commercialized by Audio Consulting (Ch). I used to told to M. Deminière and to the distributor of Aud .......
47: High Efficiency Speaker Asylum, RE: Wood horns in the US? (0.00)
Posted by Jmmlc on 2009-11-20, 08:12:19 (194.214.158.221)
Hello, Wonderful horns. I would have all of them at home (but still 11 horns there...) Congratulation to Jeffrey. Great work! Best regards from Paris, France Jean-Michel Le Cléac'h .......
48: High Efficiency Speaker Asylum, RE: Compression drivers x Cone midrange drivers (0.00)
Posted by Jmmlc on 2009-11-12, 23:09:19 (194.214.158.221)
Hello Angelo, OK, I understand that you have no pulse measurements of the S2 on the horn. Please, don't dismiss measurements, in many case they are helpful in analysing the origin of a problem. A Le C .......
49: High Efficiency Speaker Asylum, RE: Compression drivers x Cone midrange drivers (0.00)
Posted by Jmmlc on 2009-11-10, 09:01:38 (194.214.158.221)
Hello Angelo, This should lead you to question the use of those Vitavox S2. Do you have impulse measurements of them on the horn? Best regards from Paris, France Jean-Michel Le Cléac'h .......
50: High Efficiency Speaker Asylum, RE: Compression drivers x Cone midrange drivers (0.00)
Posted by Jmmlc on 2009-11-10, 03:10:28 (194.214.158.221)
Angelo, I know very well the sound of those Audax loudspeakers (Audax was a French loudspeaker manufacturer). For me it is simply very weird to find the medium delivered by the Medomex more natural th .......
51: High Efficiency Speaker Asylum, RE: Compression drivers x Cone midrange drivers (0.00)
Posted by Jmmlc on 2009-11-10, 00:20:28 (194.214.158.221)
Hello Angelo, The problem seems to be with your S2, they are problematic. I encourage you to use another compression driver (Yamaha, Onken, Goto, RCA, WE...)and to cross lower than 1000Hz. Best regard .......
52: High Efficiency Speaker Asylum, RE: Found Them! (0.00)
Posted by Jmmlc on 2009-03-09, 02:38:08 (194.214.158.221)
Hello Bill, Due to air non linearity a slowly expanding throat may induce some distortion when pressure at throat comes over 120dB. So some distortion may occur when, listening at very large SPL level .......
53: High Efficiency Speaker Asylum, RE: demonstrations (0.00)
Posted by Jmmlc on 2009-03-04, 00:42:03 (193.251.63.39)
Hello Douglas, You are plain wrong! The experiment you mentionned was done by Bruce Edgar but the comparison was not done between a truncated exponential and a conical horn as you erroneously wrote bu .......
54: High Efficiency Speaker Asylum, RE: Question (0.00)
Posted by Jmmlc on 2009-03-03, 09:53:54 (194.214.158.221)
Hello, About the origin of the honk sound of horns please read on JAES: "The Sound of Midrange Horns for Studio Monitors by Holland, Keith R.; Fahy, Frank J.; Newell, Philip R" http://www.aes.org/e-li .......
55: High Efficiency Speaker Asylum, RE: Question (0.00)
Posted by Jmmlc on 2009-03-03, 09:25:04 (194.214.158.221)
Hello, I was informed yesterday by a friend that the reason of your anger is that you are now a builder/seller of one enclosure inside which a horn build by Bill is used. So you have a good reason to .......
56: High Efficiency Speaker Asylum, RE: Question (0.00)
Posted by Jmmlc on 2009-03-03, 00:03:13 (194.214.158.221)
Hello Jonathan, Quality of sound is not something we can mesure objectively. Everyone has his own definition, so I can only agree that you can find people for which technically flawed loudspeakers or .......
57: High Efficiency Speaker Asylum, RE: Question (0.00)
Posted by Jmmlc on 2009-03-02, 09:43:35 (194.214.158.221)
Hello Jonathan, There is only one kind of conical horn one could consider as perfect: the infinite length conical horn. All others are truncated. Even if we choose a particular set of design criteria .......
58: High Efficiency Speaker Asylum, RE: Question (0.00)
Posted by Jmmlc on 2009-03-02, 01:26:36 (194.214.158.221)
Hello, Well, here in France I never saw any conical horn built by Bill but I used to listen to several truncated conical horns... My answer was only related to the original question inside which Bill' .......
59: High Efficiency Speaker Asylum, RE: Question (0.00)
Posted by Jmmlc on 2009-02-26, 00:39:30 (194.214.158.221)
Hello Josh, Mouth reflections are not strictly limited to HF, but: as their effect (= the interference with the direct wave) is strongly correlated to the distance from the rapide curvature change (or .......
60: High Efficiency Speaker Asylum, RE: I aplogize....... (0.00)
Posted by Jmmlc on 2009-02-25, 10:10:13 (194.214.158.221)
Hello, Response curves are one element but not the complete stuff. Any horn and waveguide with such abruptly truncated mouth posess a very bad pulse response because you'll have not a single pulse but .......
61: High Efficiency Speaker Asylum, RE: Comp Driver w/ different horns and their effect (0.00)
Posted by Jmmlc on 2009-02-25, 05:24:59 (194.214.158.221)
Hello John, You are right and I frighten when I read on http://www.acoustichorn.com/tech/conical/index.html "Conical horns, manifest a homogeneous radiation characteristic over a wide frequency range. .......
62: High Efficiency Speaker Asylum, RE: De250\H100 is a nice combo... (0.00)
Posted by Jmmlc on 2009-02-23, 01:10:43 (194.214.158.221)
Hello, Give a look to my message on DIYAUDIO http://www.diyaudio.com/forums/showthread.php?postid=1688645#post1688645 Best regards from Paris, France Jean-Michel Le Cléac'h .......
63: High Efficiency Speaker Asylum, RE: Strange impedance plot (0.00)
Posted by Jmmlc on 2009-02-18, 08:39:37 (193.251.63.39)
Hello, Those peaks in the impedance curves are most probably due to reflection of the waves from sections with rapid curvature (or direction changes) to the throat. Between those sections and the thr .......
64: High Efficiency Speaker Asylum, RE: paper cone midrange in a wave guide x horn loaded compression driver (0.00)
Posted by Jmmlc on 2009-02-09, 01:24:40 (194.214.158.221)
Hello Angelo, First I would advice you to be very careful about definitive conclusions based on short term experience. More than a slow quest to the good sound, many audiophiles I know, love changes i .......
65: High Efficiency Speaker Asylum, RE: This is how I do it. (0.00)
Posted by Jmmlc on 2009-01-28, 08:32:17 (194.214.158.221)
Hello John, Using the [Ctrl] key and then the [Print_screen] key you perform a complete screen copy, then most probably you'll have to crop the image in Paint. Doing an [Alt] key + [Print_screen] only .......
66: High Efficiency Speaker Asylum, RE: How do you post charts from HornResp? (0.00)
Posted by Jmmlc on 2009-01-28, 00:19:36 (194.214.158.221)
Hello Peter, The common method is to use the keyboard and while the Hornresp Window is open to action the [Alt] key and while maintaining this key to action the [Print_screen] key. Doing this the inma .......
67: High Efficiency Speaker Asylum, RE: help ID these woofers, please (0.00)
Posted by Jmmlc on 2008-11-10, 09:01:53 (194.214.158.221)
Hello Mike, For what it worth: YCM-1 are the reference for alnico magnets once manufactured by Hitachi. (seems a Chinese manufacturer of magnets uses also the same references) Best regards from Paris, .......
68: High Efficiency Speaker Asylum, RE: Exponential horn calculations (0.00)
Posted by Jmmlc on 2008-11-04, 05:04:39 (194.214.158.221)
Hello, That's a short (well "mean short") horn having a frequency cut-off of 85Hz. Under simulation by Hornresp, there is some ripple in the frequency response but it could be usable above 150Hz until .......
69: High Efficiency Speaker Asylum, RE: Are standing waves a concern in horn back chambers? (0.00)
Posted by Jmmlc on 2008-07-25, 01:07:24 (193.248.153.135)
Hello, This is true as the volume of the rear chamber can better be considered as canceling a part of the acoustical impedance of the front horn. Adjusting the volume of the rear chamber is more often .......
70: High Efficiency Speaker Asylum, RE: Are standing waves a concern in horn back chambers? (0.00)
Posted by Jmmlc on 2008-07-18, 00:06:38 (194.214.158.221)
Hello, I guess using Hornresp you may have a good view of the effect of the volume, the depth of the back chamber and of its lining. Best regards from Paris, Jean-Michel Le Cléac'h, Paris, France ::: .......
71: High Efficiency Speaker Asylum, RE: Working online Tractrix calculator-help needed (0.00)
Posted by Jmmlc on 2008-07-10, 05:24:45 (194.214.158.221)
Hello, Some additional comments about your sentence: "About what the "Keele-point" concerns, one rule of thumb is to use the double Fc as lowest usable cutoff for midrange horns. This maybe as we gene .......
72: High Efficiency Speaker Asylum, RE: Working online Tractrix calculator-help needed (0.00)
Posted by Jmmlc on 2008-07-10, 05:09:29 (194.214.158.221)
Hello, So many rules of thumb exist! Some have been introduced to design the most compact horn for the lowest cut-off for an "acceptable ripple, others have been introduced for "acceptable directivity .......
73: High Efficiency Speaker Asylum, RE: Working online Tractrix calculator-help needed (0.00)
Posted by Jmmlc on 2008-07-10, 02:41:09 (194.214.158.221)
Hello Lars, To say that the cut off frequency of a horn is related to the (mean) diameter of its mouth is a common mistake. In fact whatever the length of a horn having a known expansion, its cut-off .......
74: High Efficiency Speaker Asylum, RE: Working online Tractrix calculator-help needed (0.00)
Posted by Jmmlc on 2008-07-10, 00:14:21 (194.214.158.221)
Hello, The nearest conventional ( = old) profile to the Le Cléac'h profile is the Kugelwellen horn. (here compared among with other profiles to the Tractrix and T = 1 Le Cléac'h horn ). Notice that th .......
75: High Efficiency Speaker Asylum, RE: Working online Tractrix calculator-help needed (0.00)
Posted by Jmmlc on 2008-07-08, 10:17:01 (194.214.158.221)
Hello, IMHO a Tractrix horn having a perfectly square mouth is a theorical mistake (because the shape of the intersection of a given wavefront and the walls of the horn is never a square). A non circu .......
76: High Efficiency Speaker Asylum, RE: Working online Tractrix calculator-help needed (0.00)
Posted by Jmmlc on 2008-07-08, 00:53:11 (194.214.158.221)
Hello, In the axial version of my spreadsheet the only case of "mirroring" (but may be I don't use the word in the same meaning as you) is when using 2 orthogonal walls. This is illustrated here: http .......
77: High Efficiency Speaker Asylum, RE: thanks to all of the many posters here who helped me on my path (0.00)
Posted by Jmmlc on 2008-06-16, 03:41:14 (193.55.61.13)
Hello Triodeuser, I followed you search for the good sound since longtime and I am really happy for you that you finally reach your goal. Thanks for having, since long time, always told kind words ab .......
78: High Efficiency Speaker Asylum, RE: baffle shape for horns (0.00)
Posted by Jmmlc on 2008-06-13, 09:57:21 (194.214.158.221)
Hello, Earl Geddes will disagree with you. See: http://www.diyaudio.com/forums/showthread.php?postid=1495899#post1495899 Best regards from Paris, France Jean-Michel Le Cléac'h .......
79: High Efficiency Speaker Asylum, RE: small foam plug (0.00)
Posted by Jmmlc on 2008-05-22, 01:15:00 (194.214.158.221)
hello Bill, definitively the 16kHz peak in the response of the TD4001 is due to a resonance or a break-up mode as it is perfectly mirrored on the impedance curve whatever the horn used. A secondary sm .......
80: High Efficiency Speaker Asylum, RE: Love to see what it looks like graphed... (0.00)
Posted by Jmmlc on 2008-05-21, 02:23:35 (194.214.158.221)
Hello, As everyone knows, the TAD TD4001 driver possess a quasi conical output with a quite small angular aperture. Without any load (= no horn attached) this is at the origin of reflected waves from .......
81: High Efficiency Speaker Asylum, RE: That is not a completely true statement (0.00)
Posted by Jmmlc on 2008-04-10, 02:39:33 (194.214.158.221)
Hello, I quite disagree with you. You can use a 1 inch compression driver with a long Tractrix (or a Kugelwellen horn or a Le Cléac'h horn) and it will give you wondeful sonic results IF you don't use .......
82: High Efficiency Speaker Asylum, RE: horn colorations (0.00)
Posted by Jmmlc on 2008-04-10, 00:36:35 (194.214.158.221)
Hello John, This sentence I wrote: "In the low frequency if the horn is long then you'll have a part of the energy of the direct waves backreflected... " has to be read in the context of what I said a .......
83: High Efficiency Speaker Asylum, RE: horn colorations (0.00)
Posted by Jmmlc on 2008-04-07, 09:18:50 (194.214.158.221)
Hello Angelo, IMHO the most nasty source of coloration in the sound delivered by a "honky" horn is due to the interference between back reflected waves from mouth to throat and the direct waves. This .......
84: High Efficiency Speaker Asylum, RE: fig1 (0.00)
Posted by Jmmlc on 2008-03-04, 00:25:49 (194.214.158.221)
Hello Philip, Thanks a lot! A very enlightening figure about the misbehaviors of horns operating by diffraction like most constant directivity horns... The kind of comparison you'll never see in horns .......
85: High Efficiency Speaker Asylum, RE: Which Classic Horns used felt of foam horn lining material (0.00)
Posted by Jmmlc on 2008-03-03, 03:33:05 (194.214.158.221)
Hello, Western Electric used some felt lining in some of their large horns like the WE15A: see link. Best regards from Paris,France Jean-Michel Le Cléac'h .......
86: High Efficiency Speaker Asylum, RE: Article posted (0.00)
Posted by Jmmlc on 2008-02-29, 00:34:42 (194.214.158.221)
Hello, Could not find Figure N°1 in that downloadable document... Best regards from Paris, France Jean-Michel Le Cléac'h (BTW: Bjorn did an excellent work!) .......
87: High Efficiency Speaker Asylum, RE: Is "soundstage" an artifact? (0.00)
Posted by Jmmlc on 2008-02-18, 04:47:45 (194.214.158.221)
Hello, In an ideal multi-loudspeakers enclosure the loudspeakers should work together in phase at every frequency. Aditionnally the overall phase should evolved linearly with frequency. Very few enclo .......
88: High Efficiency Speaker Asylum, RE: Please, be Careful (0.00)
Posted by Jmmlc on 2008-02-07, 09:35:58 (194.214.158.221)
Hello, Yes, I'll be careful. I want those babies last after me... Best regards from Paris. Jean-Michel Le Cléac'h .......
89: High Efficiency Speaker Asylum, thanks Tom and Romy (0.00)
Posted by Jmmlc on 2008-02-06, 08:00:34 (194.214.158.221)
Tom and Romy Thank you for your answers. Best regards from Paris, France Jean-Michel Le Cléac'h .......
90: High Efficiency Speaker Asylum, removing fibers englued on ALTEC 755C suspension (0.00)
Posted by Jmmlc on 2008-02-06, 00:43:30 (194.214.158.221)
Hello, I bought a pair of Altec 755C. The seller took so much care to protect the loudspeakers for the shipping that he used some grey felt to cover the loudspeakers. Now, thousands of fibers are engl .......
91: High Efficiency Speaker Asylum, RE: 0.1 mH ? nt (0.00)
Posted by Jmmlc on 2008-01-29, 03:06:37 (194.214.158.221)
Hello, The Infraplanar doesn't use a conventional coil but 80 meters of wire fixed on the whole area of the diaphragm. This wire is divided in 80 segments of 1 meter long. see: http://infraplanar.fre .......
92: High Efficiency Speaker Asylum, RE: Infraplanar subwoofer T&S parameters (0.00)
Posted by Jmmlc on 2008-01-29, 01:53:58 (194.214.158.221)
Hello, The Infraplanar loudspeaker uses a 1 square meter rectangular diaphragm only hold by the 4 edges. A partial operation in flexion added with the compliance of the diaphram surely explains this Q .......
93: High Efficiency Speaker Asylum, Infraplanar subwoofer T&S parameters (0.00)
Posted by Jmmlc on 2008-01-28, 08:28:16 (193.55.61.13)
Hello, Here are the Thiele and small parameters of the Infraplanar subwoofer: Sd = 10000 cm² Cms = 3,51 E-04 m/N Mmd = 276,93 g Re = 4 ohms Bl = 11,30 Rms = 11,59 N.s/m Le = 0,1 mH Fs = 9,2 Hz Qms= 4, .......
94: High Efficiency Speaker Asylum, RE: rear loading (0.00)
Posted by Jmmlc on 2008-01-17, 00:55:11 (194.214.158.221)
Hello Tom, You are right ther will be cancellation with the Infraplanar depending on the rear load. The Infraplanar is large and could not be sold mounted in an enclosure for a commercialization. I p .......
95: High Efficiency Speaker Asylum, RE: High efficiency planar sub? (0.00)
Posted by Jmmlc on 2008-01-12, 01:39:03 (194.214.158.221)
Hello Tom, You forget that there is a huge amount of magnets at the rear of the diaphragm. Those lines of magnets acts as a rear phase plug and modify the rear loading. So a huge amount of dipole effe .......
96: High Efficiency Speaker Asylum, RE: High efficiency planar sub? (0.00)
Posted by Jmmlc on 2008-01-11, 03:49:23 (193.55.61.13)
Hello John, There is 2 frequency curves. The red one measured at 3 centimeters ( 1,18 inch)of the loudspeaker. The blue one is mesured in Claude Lacroix's auditorium (*) at the listening point (3,60me .......
97: High Efficiency Speaker Asylum, RE: High efficiency planar sub? (0.00)
Posted by Jmmlc on 2008-01-11, 03:27:15 (193.55.61.13)
Hello Gerner, I disagree with you, the pulse response of the infraplanar sub is one of the best ever published for a sub without equalization. No resonance can be seen on that pulse response (even if .......
98: Tube DIY Asylum, RE: 1 kilowatt tube amplifier at ETF'07 (0.00)
Posted by Jmmlc on 2007-12-06, 09:45:05 (194.214.158.221)
Hello Tim, This tube is still commercialized by the French group Thales (formerly known as Thomson). I guess it is still manufactured too. It is designed for HF transmission (civil + military) and I g .......
99: Tube DIY Asylum, RE: 1 kilowatt tube amplifier at ETF'07 (0.00)
Posted by Jmmlc on 2007-12-05, 23:58:04 (194.214.158.221)
Hello Tim, The output tubes are T380: http://www.g8wrb.org/data/Thales/T380-1.pdf Best regards from Paris (France), Jean-Michel Le Cléac'h .......
100: Tubes Asylum, RE: 1 kilowatt tube amplifier at ETF'07 (0.00)
Posted by Jmmlc on 2007-12-05, 07:15:09 (193.55.61.13)
Hello, IMHO, this is the most "horn compatible" amplifier one would dream to possess and use. At ETF'07 the "white light" shout out was done on Altec VOT enclosures. Compared to the other 14 amplifier .......
101: Tube DIY Asylum, 1 kilowatt tube amplifier at ETF'07 (0.00)
Posted by Jmmlc on 2007-12-05, 01:17:29 (193.55.61.13)
Hello, During the last European Triode Festival 2007 organized by Emile Sprenger and Guido Tent in Biezenmortel, The Netherlands (see http://www.triodefestival.net/index.php?page=program ) 15 tubes am .......
102: Tubes Asylum, 1 kilowatt tube amplifier at ETF'07 (0.00)
Posted by Jmmlc on 2007-12-05, 01:15:19 (193.55.61.13)
Hello, During the last European Triode Festival 2007 organized by Emile Sprenger and Guido Tent in Biezenmortel, The Netherlands (see http://www.triodefestival.net/index.php?page=program ) 15 tubes am .......
103: High Efficiency Speaker Asylum, RE: Le Cleac'h spreadsheet (0.00)
Posted by Jmmlc on 2007-11-26, 02:23:06 (193.55.61.13)
Hello, As I don't have myself any website and as I couldn't find any place on the web to put the english version 2007 of my spreadsheet the best thing is to send me your email adress at both: lecleach .......
104: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-12, 06:49:54 (194.214.158.221)
Dear David, your explanation is clear. I had the problem with T = 0 "Le Cléac'h" horn when trying to calculate the on axis reponse. With T = 0,01, the problem disappears... Thanks a lot for the modifi .......
105: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-12, 05:21:34 (194.214.158.221)
Dear David, Sure it is interesting to have the impeance curve of the TAD TD4001 on the TH4001 horn but this one is quite difficult to modelize under Hornresp. I would prefer to have the impedance curv .......
106: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-08, 23:14:21 (194.214.158.221)
Dear David, My computer is equipped with an Intel CPU. Strange thing is that the error (division by zero) during directivity simulations appears only with the horn calculated with my method ("Le Cléac .......
107: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-07, 23:47:56 (194.214.158.221)
hello René, Kinoshita's papers in JAES can be bought in line for a "moderate" (*) price at http://www.aes.org/e-lib/browse.cfm?elib=2990 http://www.aes.org/e-lib/browse.cfm?elib=2932 (*) = well, that .......
108: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-07, 08:39:16 (194.214.158.221)
Hello Haukito, Yes, on my main sytem I am using TAD TD2001 compression drivers on Marco Henry's J321 horn. A great improvement, both at mesurement and listening is obtained when using an amplifier wit .......
109: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-07, 05:08:58 (194.214.158.221)
Hello, Martin Sedon is a long time friend of mine and the audiophile community can thank him for his excellent work. I am quite accustomed to the TD4001 on horns calculated according to my method. Ma .......
110: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-07, 03:49:39 (194.214.158.221)
David, You know that the actual trend is for short horns and waveguide. This means roughly T value over 1. A conical expansion can be viewed as a Salmon-type horn having a very large value of T. It is .......
111: High Efficiency Speaker Asylum, RE: Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-07, 00:05:11 (194.214.158.221)
Dear David, I guess, we can have few parameters values from Kinoshita's paper "The Influence of Parasitic Resonances on Compression Driver Loudspeaker Performance" in JAES. I have to check if I have t .......
112: High Efficiency Speaker Asylum, Hornresp and TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-06, 03:34:29 (193.55.61.13)
Hello, First, I would thanks David McBean , for the modification of his excellent software Hornresp in order to support horns calculated by my method. Then, for those who want to simulate the response .......
113: High Efficiency Speaker Asylum, RE: Hornresp - TAD TD2001 simulation (0.00)
Posted by Jmmlc on 2007-11-06, 03:31:37 (193.55.61.13)
Hello, Thanks David, for having modify your excellent software Hornresp in order to support horns calculated by my method. For those who want to simulate the response of a horn loaded by a TAD TD comp .......
114: High Efficiency Speaker Asylum, RE: Vincent Brient's full horn system (0.00)
Posted by Jmmlc on 2007-10-12, 04:18:30 (194.214.158.221)
Hello Angelo Vincent lives nearly 300 kilometers from my place so I had not the opportunity to hear his system until now. http://www.musique-concrete.com/exemples.htm Best regards from Paris, Jean-Mic .......
115: High Efficiency Speaker Asylum, RE: Vincent Brient's full horn system (0.00)
Posted by Jmmlc on 2007-10-12, 00:25:02 (194.214.158.221)
Hello, Vincent Brient gave another information about how he performs time alignment on his 2 ways horn system. At the output of his DAC he use a DIY delay (type FIFO = first in first out). Pictures an .......
116: High Efficiency Speaker Asylum, RE: Vincent Brient's full horn system (0.00)
Posted by Jmmlc on 2007-10-11, 06:45:03 (194.214.158.221)
Hello Angelo, Recommandations from the manufacturer is related to a professional use. Here Radian specifies a guaranteed power handling of 100 watts above 500Hz, this is not a Fc. The horn used by Vin .......
117: High Efficiency Speaker Asylum, RE: Vincent Brient's full horn system (0.00)
Posted by Jmmlc on 2007-10-11, 02:22:04 (194.214.158.221)
Hello Vince, The crossover is a simple 6dB/octave at 200Hz at the input of the 4 tube amplifiers (5 watts SE300B). Same slope and frequency for the 2 low pass and the 2 high pass. The Radian compressi .......
118: High Efficiency Speaker Asylum, Vincent Brient's full horn system (0.00)
Posted by Jmmlc on 2007-10-11, 00:07:53 (194.214.158.221)
Hello, Vincent Brient who lives in Brittany (France) improves slowly but regularly his system. The last evolution is a fantastic 2 ways system fully horn loaded with a giant bass-horn loading Altec 51 .......
119: High Efficiency Speaker Asylum, RE: Lynn Olson's very good thread.... (0.00)
Posted by Jmmlc on 2007-09-21, 00:53:04 (193.55.61.13)
Hello, Concave wavefront: I guess Lynn refer to a monophonic message for which the 2 lobes from the loudspeakers add at the place of the listener… I don’t think there is so much difference in the conc .......
120: High Efficiency Speaker Asylum, RE: Any way to model LeCleac'h flares in HornResp? (0.00)
Posted by Jmmlc on 2007-09-19, 09:38:06 (194.214.158.221)
always one link missing (it disappeared) http://f1.grp.yahoofs.com/v1/gEfxRtYtOOWCwkJhpWoMJWY0BdYR36L-7HDg2oh4Sr3QmtIiSwZZuhnx_l23YEAs4VC1NMz83owhSWCV7Q/Le_Cleach__Jean_Michel/Vue_3D_360d.jpg ::: TOPI .......
121: High Efficiency Speaker Asylum, RE: Any way to model LeCleac'h flares in HornResp? (0.00)
Posted by Jmmlc on 2007-09-19, 09:35:03 (194.214.158.221)
Hello, I missed something when writing the last links to see several 3D views of my new designs: They are inside the files of the [son-qc] forum: http://fr.groups.yahoo.com/group/son-qc/ ( you can sus .......
122: High Efficiency Speaker Asylum, RE: Any way to model LeCleac'h flares in HornResp? (0.00)
Posted by Jmmlc on 2007-09-19, 09:19:11 (194.214.158.221)
Hello Vince, Long time ago I wrote a paper in the Belgian francopphone review Musique & Technique (Issue n°6). If you read French, excerpts from that paper, additional information and figures can be .......
123: High Efficiency Speaker Asylum, RE: Any way to model LeCleac'h flares in HornResp? (0.00)
Posted by Jmmlc on 2007-09-19, 04:53:09 (194.214.158.221)
Hello, When using T = 1 in the spreadsheet to calculate horns according to my method, you obtain, along more than 90% of the axial length, a profile similar to the Tractrix. But using my spreadsheet y .......
124: High Efficiency Speaker Asylum, RE: Power response question (0.00)
Posted by Jmmlc on 2007-09-13, 06:18:46 (194.214.158.221)
Hello, Above its cut-off the ideal horn provide no loss to the signal so the power response should be equal to the one measured on a planar wave tube. The main source of loss within the horn is IMHO t .......
125: High Efficiency Speaker Asylum, RE: DJK or others, time alignment question.... (0.00)
Posted by Jmmlc on 2007-08-28, 00:49:04 (194.214.158.221)
Hello, To provide a perfect summation ( =1 or = flat response curve) of a LR4 low-pass plus a LR4 high-pass the 2 drivers must be at the same distance to the listener's ear ( = on the same baffle or i .......
126: High Efficiency Speaker Asylum, RE: Reply to Misc. Questions (0.00)
Posted by Jmmlc on 2007-06-28, 01:45:01 (194.214.158.221)
Hello, Angelo's question was related to hifi use not professional audio. In hifi use that's very rare to feed a compression driver having an efficiency larger than 110dB/1W/1m with more than 0,1watt R .......
127: High Efficiency Speaker Asylum, RE: how on earth could that be time aligned? (0.00)
Posted by Jmmlc on 2007-06-28, 01:35:06 (194.214.158.221)
Hello Angelo, About what I called "rear cavity": Behind the diaphragm of the Community M200 there is a (closed?) chamber, you can see it on the drawing in the pdf document. This cavity is quite small .......
128: High Efficiency Speaker Asylum, RE: how on earth could that be time aligned? (0.00)
Posted by Jmmlc on 2007-06-27, 08:48:53 (194.214.158.221)
Hello Angelo, Goto drivers have surprinsigly goods sonic results when we consider the quasi artisanal work (the presence of irregularities on the surface of the diaphragms and the suspensions is often .......
129: High Efficiency Speaker Asylum, RE: how on earth could that be time aligned? (0.00)
Posted by Jmmlc on 2007-06-26, 01:35:20 (194.214.158.221)
Hello, This pictures shows an old version of J.Y. Kerbrat's system. This is a no limit system and J.Y. Kerbrat doesn't hesitate to becomes official importer-distributor for France of such brands like .......
130: High Efficiency Speaker Asylum, RE: Polling people who've heard TAD 4000 series drivers (0.00)
Posted by Jmmlc on 2007-06-19, 09:42:07 (194.214.158.221)
Angelo, The problem with most compression tweeters is that their horn is too small and they use often a lot of diffraction. Also most of them should be considered as supertweeters and crossed over 12k .......
131: High Efficiency Speaker Asylum, RE: Polling people who've heard TAD 4000 series drivers (0.00)
Posted by Jmmlc on 2007-06-19, 00:32:51 (194.214.158.221)
Hello, Ribbons are excellent but in a different application. Most of them operate as dipoles and are difficult to match with other ways using compression drivers + horns due to a very different kind o .......
132: High Efficiency Speaker Asylum, RE: Polling people who've heard TAD 4000 series drivers (0.00)
Posted by Jmmlc on 2007-06-18, 09:00:58 (194.214.158.221)
Hello Angelo, I heard both the TAD TD4001 and the Radian 950. They sound different. The TD4001 is far more linear (both at measurement and listening) and the sound is very dependent on the horn (perce .......
133: High Efficiency Speaker Asylum, RE: Polling people who've heard TAD 4000 series drivers (0.00)
Posted by Jmmlc on 2007-06-16, 01:15:06 (194.214.158.221)
Hello Duke, I heard that the next generation beryllium diaphragms for TAD drivers will be built in China. (This doesn't mean they will be bad, we know a lot of excellent manufactured products coming .......
134: High Efficiency Speaker Asylum, RE: optimal horn type (0.00)
Posted by Jmmlc on 2007-05-31, 07:43:25 (194.214.158.221)
Hello, That's right. The only exception is if you process the signal sent to the loudspeakerwith a DSP in order to obtain a linear phase signal at the mouth . Best regards from Paris, Jean-Michel Le C .......
135: High Efficiency Speaker Asylum, RE: optimal horn type (0.00)
Posted by Jmmlc on 2007-05-31, 05:00:08 (194.214.158.221)
Hello, There is several possible answers to that question but here the most logical: - in order to operate the horn inside a frequency range for which the acoustical impedance of the horn is mainly re .......
136: High Efficiency Speaker Asylum, RE: optimal horn type (0.00)
Posted by Jmmlc on 2007-05-31, 01:06:19 (194.214.158.221)
Hello, 70Hz to 800Hz is more than a decade. That's a very difficult task for any horn to cover such a large interval of frequency Even the Ale Horn reference EX70 covers only the interval 100Hz to 500 .......
137: High Efficiency Speaker Asylum, Re: CD compensation networks causing distortion? help! (0.00)
Posted by Jmmlc on 2007-05-10, 08:26:56 (194.214.158.221)
Hello, Recently I have to test a tube amplifier (SE845)belonging to a friend. On square pulse test ther was some resonance around 25kHz (+1,5dB) visible on the scope so I decided to use a RC filter to .......
138: High Efficiency Speaker Asylum, Re: complete list of all contemporary hornspeaker manufacturers (0.00)
Posted by Jmmlc on 2007-05-10, 08:18:43 (194.214.158.221)
Hello, missing: http://www.azurahorn.com/index.html http://www.musique-concrete.com/ Best regards from Paris, Jean-Michel Le Cléac'h .......
139: High Efficiency Speaker Asylum, Re: DcR of TAD 4001 redux (0.00)
Posted by Jmmlc on 2007-04-30, 10:23:56 (194.214.158.221)
Hello, Impedance measurements are done at very low current and this cannot hurts the driver. Eventually one could listen to the TD4001 unloaded wideband as headphones (the ear closing the throat of th .......
140: High Efficiency Speaker Asylum, Re: DcR of TAD 4001 redux (0.00)
Posted by Jmmlc on 2007-04-30, 01:41:58 (194.214.158.221)
Hello, Here is the impedance values of the TAD TD4001 mounted on the TH4001 horn: Freq impédance 23.44 7.37 58.59 7.44 105.47 7.63 199.22 8.67 257.81 11.98 292.97 14.43 316.41 11.44 351.56 9.50 410.16 .......
141: High Efficiency Speaker Asylum, Re: is time alignment really so important ? (0.00)
Posted by Jmmlc on 2007-04-27, 07:49:04 (194.214.158.221)
Hello, Alone or with a group of audiophiles, I did very often this kind of test using the programmable presets of a digital crossover (Behringer DCX2496) and everytime the best sound quality was obtai .......
142: High Efficiency Speaker Asylum, Re: is time alignment really so important ? (0.00)
Posted by Jmmlc on 2007-04-27, 05:42:32 (194.214.158.221)
Hello, Most of the old studies about what is known as "phase distortion" concluded to its inaudibility. (At the time it was difficult to counteract this source of distortion and the tests were general .......
143: High Efficiency Speaker Asylum, Re: Who invented the compression driver? (0.00)
Posted by Jmmlc on 2007-04-10, 01:12:07 (194.214.158.221)
Hello, The Western Electric WE555 compression driver has been described in 1926 by E. C. WENTE and A. L. THURAS in an internal bulletin of the American Telephone and Telegraph Company (ATT). The Bell .......
144: High Efficiency Speaker Asylum, Re: Question Re : 4th order Linkwitz-Riley LC filters (0.00)
Posted by Jmmlc on 2007-03-13, 06:21:18 (194.214.158.221)
Hello, You can calculate a passive crossover 4th order Linkwitz-Riley on that webpage: http://www.ajdesigner.com/crossover/crossoverfourth.php Original formulas from Linkwitz are on the page: http://w .......
145: High Efficiency Speaker Asylum, Re: Horn resp question (0.00)
Posted by Jmmlc on 2007-03-12, 01:53:36 (194.214.158.221)
Hello, Open an imaging software (Paintshop or similar). Go inside the Hornresp window you want to capture. then type the key [Alt]and while maintaining it type the key [print scrn]. This copy an imag .......
146: High Efficiency Speaker Asylum, Re: Notch filter for TAD TD4001 (0.00)
Posted by Jmmlc on 2007-02-17, 01:24:43 (194.214.158.221)
Hello, What is the cut-off frequency of you crossover and its slope? remember that the TD4001 possess a beryllium suspension (in fact a single piece with the diaphragm). It is not recommanded to cut i .......
147: High Efficiency Speaker Asylum, Re: the on-axis hole (0.00)
Posted by Jmmlc on 2007-02-02, 09:10:10 (194.214.158.221)
Duke, As I told you I don't see myself such a hole on my measurements some of them can be seen at: http://www.musique-concrete.com/mesures/321direct.gif due to the precision of the measurement, if thi .......
148: High Efficiency Speaker Asylum, Re: the on-axis hole (0.00)
Posted by Jmmlc on 2007-02-01, 04:45:37 (194.214.158.221)
Hello Duke, IMHO: in the case of a waveguide filled by foam, the origin of such a hole of 3 DB cannot be a reflection of waves from the mouth. Best regards from Paris, Jean-Michel Le Cléac'h ::: TOPIC .......
149: High Efficiency Speaker Asylum, Re: the on-axis hole (0.00)
Posted by Jmmlc on 2007-02-01, 01:39:45 (194.214.158.221)
Hello Duke, The strange thing about what you said about Earl Geddes's Summa is that Earl Geddes developped his waveguide in order to avoid those HOMs that seemingly are at the origin of the hole you m .......
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