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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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It is what I hate the most among typical Audio Morons: they are willing to clown like idiots on any subjects and invent within their sick and frighten minds the imaginary Nuremberg tribunal but they at the same time are completely disabled to und...
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Well, I have a theory that the rough surface may be helping to attenuate multiple back-forth axial reflections, but from what you say, it may be that it results in - what's the proper term? - irregular as opposed to laminar flow at the surf...
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Years ago, when I visited the Cogent guys, Rich was working on one of their big drivers. The diaphragm was big and even thick and heavy, as compression driver diaphragms go. Of course they used 300B amps, and the bottom end had the "sewer pipe" type ...
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It's interesting that the enthusiasm in going to a more convenient but lower fidelity system is apparently higher than the reverse. Shows why audiophiles are a niche sect. The OP would have been more convincing if the enthusiasm was paired with a log...
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Very interesting. I tried something similar years ago but was foiled by inumber of problems, including the fact that I was trying to drive it all with a single stereo SS amp. I just could not get anything consistent, and in my case a...
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[quote user="cv"] Well, the Cogent (Steve Schell and Rich Drysdale) boys are building just such a beast: field coil magnet, (possible) permendur polepieces for >2T, Fs 70Hz, throat - dunno, but at least 3" dia, reduced compression ratio relative t...
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[quote user="guy sergeant"] Having said that I've never heard a properly working WE555 or 594 either and given the problems of getting the S2 to work well I can't imagine there are many installations using those drivers with the right sort of horns t...
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[quote user="audiofilofine"] Sorry but I prefer not to say the brand of the diaphragms .I used only moving parts and not the structure, the suspensions were treated with a silicone resin[/quote]Yes, it is good thing to treat suspensions not the c...
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[quote user="slowmotion"]I hope anyone interested in JMLC horns read the last four links, where Jean-Michell writes about his reasoning for his horn profile.[/quote]
Yes, Jan, tanks it was interesting. Unfortunately the words means little in ...
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Romy, it sounds like you are well into this, already. We used to use extremely sheer silk with our "secret" doping formulae. The key is to keep it as thin and flexible as possible. Today, I would look for resin/glue with "fibers" in it to bridge t...
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Allo,Thanks for that - I've revisited the relevant portion of the "My playback" section and I have to say, I think I understand a lot more clearly now having a) spent time on this site and b) read the little recap in your post, which is a very cogent...
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[quote user="Paul S"]Romy, I have for some time called this phenomenon the "necessary roughness", and one of the things I liked (loved, actually) about Cogent's main field coil was that it did this very well indeed over about 2 octaves; in fact, it w...
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I recieved and accepted an invitation to hear an earlier version of the Cogent speakers, and I was subsequently asked for a considered opinion of the sound. I guess the designers had read from my posts various criticisms of horns in genera...
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I find this project so fascinating. I find it particularly interesting because one of my first experiences of good sound involved a field coil driver. Many years ago my grandfather bought an old hammond chord organ(predates the b3 and other...
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"but it highly likely
that PurePower buttery does stay online during the unit run from AC"That's all I am saying also! My idea is ONLY that PP changed the degree to which the equipment *sees* the AC source instead of the battery source. How isolate...
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hi romyi disagree totally with your point of view regarding audio industry. i think first of all, what this all is abought, is to have fun listening to music. and it is VERY subjective, what is good sound reproduction, and what is not. if someone doe...
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Don't worry Romy, I know exactly what you mean. I tend to discount the opinion of anyone who raves about a system's ability to play back patricia barber. Speaking of which, if I were in her shoes, bunions and corns aside, I'd be mildly...
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The big RCA field coil is the best thing about the Cogent system. It has great "promise", based on what I heard. Although their methods of "developing" this driver seemed confused to me, they do have truly encyclopedic knowledge...
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Kerry, from what you have said so far, I am not surprised that you have gone whole-hog digital. I see that yours is an HT system. The first thing anyone here would say is, physically time-align your HF, although I suppose you "could" do that with DEQ...
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VERY interesting observation, Romy.I fought with but was unable to overcome both dynamic "tromboning" and also a closely-related sort of "shaping" effect, and now I wonder if this relates to the "proximity effect".I did limited experiments ...
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Not to be too presumptuous but i thought i'd start a thread that could serve as a repository for lowther comments, ideas etc.the impetus for this was that rola experiment i mentioned in the cogent rmaf thread. I was thinking hmm, 'hard', 'shouty' tha...
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Personally, speculatively. It's my belief that one or one maker *shouldn't* have to wander too far past this range for practicality and morality...I can understand if some goodness can't be value developed easily (even then, there could be probl...
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[quote user="Romy the Cat"]I have a few comments and questions. First about the posting. I guess you are from Italy and your use some kind of text editors that user a lot styles that are not renders properly a browser with western meetings. I just wo...
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[quote user="be"]"the cavities behind the coil are not the cavities where pressure passes"
Yes, but the speach coil and diphragm can "see" the air volumes behind the magnetic gap and will be loaded by the resonanses created, and the radiated s...
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eyop fellas,Romy wrote: "Here we go! Not we are taking!!! I would not need the S2 tweeter and what it dose now in 400Hz horn is perfectly enough. I would go only for the midbass S2. Something with 6” cellulose diaphragm, low to medium compressi...
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Thank you Romy and congratulations on your website, it just keeps getting better and better all the time.
The RCA1428 is a great sounding driver on RCA multi-cell horns. Not that I like multi-cell sound. I have never heard an original 1428 on a tra...
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Romy,
Why preface my comments ? I've had the same system for 10 years basically. I do use digital crossovers but the 'Class D' NuForce amps are not digital at all. And the NuForce amps don't sound like stereotypical Class D amps, they are very quie...
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[quote user="ayebee"]If you look at the original Bionor drawings (you can find them at klangfilm.free.fr) you see that the "bass" horn is actually made out of two sections, the outer is curved, the inner is conical and expand both horizontally and la...
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Years ago, the two different systems in which I heard RCA 1428s - in a fairly big warehouse and crammed into a basement listening room - used giant RCA multi-cell horns in combination with giant Ubangi bass bins, passive crossovers and vintage WE or ...
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That's one big tweeter, Romy, and, typically, it was made that big only because they intended for it to go low. I keep wondering about the effects of the extra mass, if nothing else, but also about dispersion and window blind effects ...
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