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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="be"]Hi!Let me point out that two field coil magnets with identical iron parts, but different field coil wire thiknesses, will at the same field coil power dissipation produce exactly the same magnetic field and the loudspeaker will hence...
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[quote user="coops"]Ralph and Thomas are friends there would have been no price premium for the field coil option …[/quote]Considering that Cessaro claims that they pay for $500 worth TAD drivers (OEM) over $5000 then I might only imagine how much pr...
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[quote user="jweiss"] When we spoke at CES, you mentioned that your experience with field coil drivers only extended to cone types. So I assume that you have never heard any field coil compression drivers. That would include the WE 555, 594, RCA 1428...
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Here is the similar approach undertaken with Altec 288C to the one that I took with my Vitavox
http://chaudioroom.com/CH288287.html
Some critiques. A minor mistake in the text is that the author says that “magnetic fields generated will go down to ...
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[quote user="audiofilofine"]to reel from 7 volts or 700 volts is equal to the reel. should rather ask why or why 7 or 700 volts. should be asked how you intend to use the horn driver, you should ask graphs of frequency response and power handlin...
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Well, when we are talking about Cogent we need clearly differentiate two things: the Cogent’s drivers and the Cogent’s installation. The problem is that since Cogent’s drivers are something so called “compression drivers” then their performance might...
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[quote user="Wojtek"]and especially "perfectionists" markets like Germany. Sound is of a secondary importance. I bet the new driver from Cesarro will be field coil driver because that's what peoplewant NOW. They want "the best" and field coil is now ...
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True, I don't know exactly what is that modification!I am not able to find where I saw they modify the drivers but here you can find some pictures of the Cessaro power supply at least and some generic citations:http://www.audioexotics.hk/index.php?op...
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[quote user="coops"]I have re-read your post and your tone sugests that field coil drivers wi be used by manufacturers purely for their marketing appeal and not for any sonic improvement, Thomas Woschnick has just taken delivery of a pair of Ce...
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Ok, this is probably the most important section as besides all positive changes that PP2000 does to sound it does this one, the one that I call “softness”, and the values of this “softness” have to properly understood and interpreted.
The “softness”...
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Hi!Let me point out that two field coil magnets with identical iron parts, but different field coil wire thiknesses, will at the same field coil power dissipation produce exactly the same magnetic field and the loudspeaker will hence have same parame...
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Well that was my father. We founded the company together - he invests, I researches, mostly. Bruce Edgar and Sam Saye taught me how to design, and we built our first prototype system in California.Think I need a bit more clarification on the five tim...
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Erik, I do not think a resistor in series would do as it will burn on itself some voltage and the coil will be driven by the same voltages. It would be good to put in place of the resistor a rheostat and to slide it up and down while slide up and dow...
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[quote user="Romy the Cat"]
I do not know any advantages because the fact that the sound softer. I personally believe that the electromagnets have HIGHER MOMENTUM FLUX MODULATION and that make them to “sit” slightly… or exactly what I would like t...
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[quote user="Romy the Cat"]Yesterday, I spoke to a very knowledgeable guy who is working with theories and practice of magnetic cores for 40 years and asked him about any possible benefits of making whole magnetic pathways from Permendur. He was laug...
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Yes, CV, I thought about it myself and I fine that this might be VERY interesting to play with. Unfortunately, or fortunately, I am months away from the position when I will be able to do it. The subject is devilishly interesting however. I think it ...
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are pair of jbl 2420work with 100-130 voltpower supply is with 5u4 tubei use with diy tactrix horn and jensen field coil woofers.crossover at 800 hz 6 db or when use 3 way multiamplification 800-8000 in this case tweeter is old jensen-magnavox.no sel...
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In the case of the Audio Note field coil cartridge the field strength (and hence output) was significantly less than that from the permanent (AlNiCo) magnet equipped Io. Yet the performance of the field coil version (Io Ltd) was 100x better despite a...
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What I think I would need is microscopic pneumatic valve that I would be able to stick into my back chamber and that would have a little-bolt that would allow adjusting the diameter of the leaking “port”... Sure, it would be fun to have the valve to ...
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[quote user="Paul S"]Here's something from a guy perhaps better known for his direct radiators:http://cgi.ebay.com/Atelier-Rullit-RH-T903-field-coil-drivers-/330581513356?pt=Vintage_Electronics_R2&hash=item4cf831948cBest regards,Paul[/quote] for ...
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A few years ago playing with my favorite Vitavox S2 driver I was asking myself how it might sound if instead of the Alnico magnet the electromagnets would be used. As many other driver of the period the Vitavox did not utilized the only one magnet ty...
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Hi Romy,I've seen and heard many products in which an aspect of the design is interesting, even thought provoking but where that idea's implementation is poorly achieved. It doesn't mean that one can't learn anything from the product even if it's onl...
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All below is written by Thomas Dunker
Yeah, "sound consistent independent of signal level" is a very precise way to sum up my whole speaker philosophy. Anything that is assumed to be constant, but which actually changes with signal dynamics is what ...
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I agree that the total flux will be the same but therefor in the same iron structure, the field in the gap will be the same, at least in the statical case.If the system is modulated by the speach coil, a simpel measure of how well the...
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Here's something from a guy perhaps better known for his direct radiators:http://cgi.ebay.com/Atelier-Rullit-RH-T903-field-coil-drivers-/330581513356?pt=Vintage_Electronics_R2&hash=item4cf831948cBest regards,Paul...
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"Eyes do the hearing" is a comment geared toward you as you make alot of assumptions based on just wait you see in photo .Your reality or mine?I was reading your comments on you s2 field coil and i think you have alot of good info about field c...
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Romy , I don't doubt any marketing opurtunity will be seized upon, have you experimented with field coils ? I have't heard the driver in the Beta, I am told that there isn't a great deal of difference sonically between the fiel...
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Romy,
Air core is ok, but. 1. Self inductance in an unmitigated field clumps. You can easily see this by unwinding a hockey puck style air core inductor and measuring the inductance with each turn removed. Never will you have the smooth loss of indu...
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I have re-read your post and your tone sugests that field coil drivers wi be used by manufacturers purely for their marketing appeal and not for any sonic improvement, Thomas Woschnick has just taken delivery of a pair of Cessaro Beta's which u...
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http://www.field-coil.com/ ... sorry i've got a soft spot for his stuff ...
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