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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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"PrimaryControl is
presenting a new bearing technology, the world’s first field coil loaded
unipivot tonearm. This technique provides high torsional stability and a
low moment of inertia for the tonearm. Bearing chatter...
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Yes, Rulit does try to push envelop of something. He does exiting projects but I do not know how all of it manifests itself in actual results. I said that he pushes the “envelop of something” as I do not know what this “something” is. I never h...
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[quote user="mats"]Too late now for points, but just the other day I tried to imagine your plan. and I was pretty close.Actually, it is a bit like what I have going now; 15" Eminence bass guitarr woofers in a sealed 3 cu ft cabinet,Oris 150 with...
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The Other End of the Single End: Modern Horns Done With Flare An Interview With Dr. Bruce Edgarby Dave Glackin, printed in POSITIVE FEEDBACK. 1996
Dave Glackin interviewed Dr. Bruce Edgar in his home, prior to the 1996 WCES. A follow-up on the speak...
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[quote user="haralanov"] I will not call this excitement, let say it dynamic stability. [/quote]
Hm, the “dynamic stability”. This is a new objective…
[quote user="cv"] I suspect [David]he feels more comfortable with coils running at low vo...
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[quote user="be"]Romy wrote:
"However, the diaphragm in the small JBL 2420 driver is full metal (correct me if I am wrong) and there is absolutely nothing in that driver that might be soften mechanically."
The speach coil former seems to be...
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I am glad that he did not stop on TADs and look elsewhere.
It is hard however as the demands for better drivers is very low that makes
them to be literally 100 times more expensive then they need to be (field coil
are very cheap to make) and that ...
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[quote user="hagtech"] Yes, steel chassis can be both good and bad. It likes to conduct magnetic fields, so you have to treat things appropriately. A little spacing under a choke can go a long way. Otherise you have a 120Hz motor.&n...
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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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What is interesting, and this is not Wheel-Fi problem but
much wider problem, that we in audio still are clueless how to present speakers.
The video above is fine but it is only fine in very confined zone of the Wheel-Fi
audio interests. As the re...
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Last weekend, just for fun, I brought the amp and preamp to the 2011 Burning Amp in San Francisco. On the first speakers, the Audio Kinesis, I let the heater warmup for about 15 min, and then switched on the power, the amp was fine, we played...
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OK, I split the thread: “Best of the HE2006!!!” there extracting the Cogent’s related posts into a separate thread….
[quote user="Paul S"] The big RCA field coil is the best thing about the Cogent system. It has great "promise", based on what ...
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Dear Robert and Roman,[quote user="Romy the Cat"]Chris Widmer [sic] does not understand it as
well not to mention that his attempt to explain the high price of
Feastrex sound too bogus.The Cat[/quote]You are certainly welcome to speculate about suc...
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Thanks for your comments Romy.
You should like this bit of news... I forgot to mention, these will be round-section horns...
And yes, they will be very heavy... Made from a metal armature and very thick, natural (hemp) fiber-reinforced, plaster...
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Yes, Jonathan,
I have seen this resemblance with JBL in the shape of the back plate but it does not mean anything. The curved back magnetic path make a lot of sense, so he might adopt it from JBL. There is nothing wrong with it.
I do not k...
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Cat wrote:"It has the
same ability to super precise to follow the very minute dynamic
fluctuation of signal and superb transient but those phenomenal
qualities are not connected with anything else, primary it has no
correct harmonic bac...
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[quote]That is a bold waste of
speaker’s surface for a small result.[/quote]Yeah, but plywood is cheap and the result is audibly noticeable. Baffle extensions were recommended for all of the Altec VOT cabinets too. Make a big improvement for cheap ...
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There are 3 thing about which I would like to share my view
1) Air vibrations transmitted to the amp. I do understand
concerns about vibration transmitted over hard surfaces. The vibrations transmitted
over the air? I do not think so. I personal...
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[quote user="haralanov"] First of all, I want to note that when somebody lives on the principle of denying everything, he risks to live in his own encapsulated world, build according to his own principles in order to feel comfortable there. [/q...
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[quote user="rdrysdale"] I mean that with a horn loaded compression driver, a strong motor, and a very light diaphragm, the attack and transients are more life like. Because the diaphragm can more precisely follow the recorded signal, the reproductio...
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[quote user="jweiss"] It was good to finally meet you at CES at the Cogent Room. I guess that you really found Steve and Rich's drivers pretty interesting (you initially wanted to buy a pair of the midrange drivers, remember?) [/quote]
Hi, Jonathan....
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This thread has been pretty interesting overall. I've read most of it and would at least like to provide some feedback on the technical side of designing with the 45 and 2A3 DHTs... at least from my personal experience. A few years back I decid...
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Well, I was there, which is more than The Cat can say. In fact, The Cat never heard a complete WE system first hand, so I'll have to take that into advisement when the expected foaming-at-the-whiskers rant.I always wonder why people would giv...
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[quote user="vinylithicum"] Here are some of my observations regarding the Wolf von Langa RCA 1428 replica. I long time wondered where mr. von Langa gets his phase correction elements and the diaphragm for his RCA 1428 replica. It's obvious that ...
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[quote user="twogoodears"] BTW: while in Berlin, last May, Frank Schroeder performed an interesting, provoking "blind-test" using '50s and '60 Telefunken's midrange loudspeakers (22 cm diam.), comparing FC vs. PM:almost everyone in the listening ...
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[quote user="Jeffrey Jackson"] so, my straight horns... I like them very much.. I built mine similar in style to what Greg B linked, but obviously much smaller.. mine are just under eight feet long (length of a sheet of plywood) and have a mouth roug...
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[quote user="rdrysdale"]Our bass driver has a 12v field coil motor, it developes just over 20 kilogauss flux density using a low carbon steel pole piece. The exit diameter is 4 inches at the moment. The diaphragm is 6 inches in diameter and made of a...
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[quote user="Joe Roberts"] Yeah, but plywood is cheap and the result is audibly noticeable. Baffle extensions were recommended for all of the Altec VOT cabinets too. Make a big improvement for cheap if you have the space.
As the frequency dec...
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Show Report PiS Festcomposed by Johan Dreyer
This show was held at the Rama Sebo convention centre in Freetown on April 30 and May 1.Unfortunately my kids played with my camera and destroyed the photos.Highlights were:JBL announced that they were s...
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