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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy,To clear up a few things about the Kilimanjaro RCA1428 clones.The B&C DCM50 is a modern, neodymium clone/copy of the RCA MI-1428B. It was designed and built by B&C in Italy after Bill Woods of AHhorns talked the CEO into it. The DCM50 is...
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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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Despite my generally-negative experience of driving Vitavox S2 from field-coil I might consider to try in the coming year the same experiment one more time, since I am driving my MF driver now by a different DHT amp. I would like to see how the D...
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[quote user="Romy the Cat"] your diver might be a very good MF diver but it does not go to region where the “tizzing” live.[/quote]You may not believe me, but the driver start to roll off (very smoothly) after 14kHz and at 20kHz is at -6dB. I intent...
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Thanks for the picture Romy. I couldn't unscrew the top threaded piece myself. Perhaps I was turning it the wrong way?! Any guidance you could give on dismantling the driver would be appreciated.
Regarding the active flux modulation idea; I think yo...
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Romy, 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 mad...
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The idea of making a copy of an s2 driver also intrest me, but i have some other ideas than just copying this driver.I have been thinking to make this driver with an field coil magnet a 12 volts (using a car or camping battery) and a 250 volts versio...
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CV,Nicely put.... and thanks for the Rp information on the 6C33. Do you have any thoughts, or a curve trace source, about the Rl ratio?
Now, since air core's are to be your weapon, here are some thoughts to explore.
1. Wind biffilar or ...
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| agree with your feline wariness with regard to torch bearing disciples of any given faith, be they believers in Altec, Audio Note or even Vitavox. In the case of Audio Note the fervour has often been exacerbated by the activities, pricing and ...
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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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Not to dismiss the matter of the (non) existence of the FC L405, since I have not seen one, and I do not know (or care) about this...Regarding the "applications" for the cinema/PA-type drivers, broadly speaking, these drivers were/are "purpose built"...
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No, the 1443 is also a field coil, just a different voltage.Re: the configuration - indeed; I am hoping to get 300Hz with the RCA, then the S2 from between 1k-1500 and up, + tweeter. Below the RCA willbe a compromise to begin with, but hope...
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The BP30-2 post has hex head. You might get any hex wrench and it is no problem anymore. I found that that the Audioquest wrench is VERY comfortable as my posts are flimsy for my cables (Dominus is VERY heavy) and I shall not apply overly high to...
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At CES there were Viagra-junkie sized power cords everywhere for $5000. Around our room were $10k and $20k speakers that sounded like a wet jukebox. It was the land of delusion.Value per topology is one way to measure but let's instead start with a p...
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Josh,
I see, for a time being you target your driver to use with your horns. That is fine. BTW, did you come across to an observation that you tend to load your anodes that drive the field-coil drivers idler than when the same anode drive perm...
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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 a niche-manufacturer such as W. ...
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Hello chaps,Firstly, something I forgot before was that the high impedance coil will have more turns... so the DCR etc will be stepped down as seen by the voice coil. My guess is that overall it will still provide slightly less damping, due to imperf...
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Hi Haralanov.
My "friend" said that he made an experiment where he heated a permanent magnet up and thereby made it sound more like a field coil magnet, both with the same front.
If we can take this claim as true, it is evidence that the ac...
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Somebody at AA asked about the difference between electromagnets and perm magnet. Thankfully the AA idiots who pick the pieces of brain at my site and already learned that the idiotic blabbering about “the electromagnets have more flux” is comple...
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I would agree that the Lowther is not hard to beat but the question is where and in whose mind does this competition exist? Is the Lowther, Manger, or other full range single driver in competition with different multi-driver approaches, other single ...
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[quote user="Jeffrey Jackson"] first, basshorns... the basshorns that I posted here some years back are my straight ~50Hz horns (my memory is fading)... they are 8' long... then rear chamber.. mouth ~ 3' x 4'... throat ~8" x 8"... rear chambers of va...
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[quote user="Jeffrey Jackson"] so a few things... one, there is a pair of Goto 370 on eBay and pictures of insides... the newer ones are made the same, but it seems that the execution has gotten a better/cleaner compared to these.. my diaphragms look...
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Hi Paul,The net gauge for one cable of the 140 strands of #40 stuff is #15 AWG, as far as circular mils of area vs current induced heating goes. The surface area is some 13 times that of a solid #15 gauge copper wire. A minimum of 10 times the surfac...
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Something they mustve obviously done better than others using beryllium. Judging the sound. In a positive way. The lower 3 are titanium, but all upper 3 are 4/3/2 inch BE sourced from truextend. The suspensenion however is soft and allows excursion.I...
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I have identified a direction for my next speaker system. Whether it is a good one or not is a different topic -- I think it's a good one because I've lived with my current horn system for 10 years and have since developed an understanding of it's st...
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[quote user="Romy the Cat"]
Haralanov,I spoke with a guy who consulted me during my Electo-Vitavox project. He helped me with selection of core material, deliberated the core and calculated the right coil to keep the core mass optimally magnetized....
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Decoud, I do reject any speculations about flux modulation in compression drivers as I do presume that it is absolutely negligible. It is like using a SS amp with ultra low output impedance, to drive a ribbon tweeter and to worry about return current...
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Thanks, Kerry. It was interesting. I never used neither RCA1428 driver nor it’s clones. I heard them I think once at Oswald Mils. It was for sure a pleasant midrange but it was nothing else wothe attention in there, so it is difficult to say anythi...
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[quote user="Romy the Cat"]
haralanov wrote:And the very same is with electromagnets. With those so widely used 12V power supplies (Fertin, Feastrex for instance) the sound is always softer than it should be in reality with severally restricted dy...
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[quote user="Romy the Cat"]So, I guess you do not measure flux if are getting. You might measure sensitivity and we might presume what when perm magnets has the same sensitivity as electromagnets then the drivers have the same magnetic flux density. ...
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