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hi
i am in touch with a company in south east asia, which manufactures and sells high-end audio products ( horn speakers, compression drivers, valve amplifiers etc. )They are open for new product developments ( one suggestion i gave them was Thuras field coil compression driver, and they are considering such a project. Something else, i think would be great, would be a WE555 scaled up, maibe with 50% bigger diaphragm, to cover lower midrange ). If you could freely suggest , what would be on your wish list ?
Follow Ups:
The Eckmiller O15 field coil version.
"The Eckmiller O15 field coil version" That would be a good start. Maybe a 18inch version.
I would go the other way and do a 15" and 12" version.
any decent fc with paper approaching the quality of vintage German paper at a affordable price. phenolic spiders? I don't think vintage German quality paper has been reproduced anywhere in recent times. Even a silk based paper like the we 555.I suspect the key is the embossing. the 60's coral type paper was very good too and yet so totally different.
I wonder what it would cost to make a good kl405?
We have Kurt Mueller to thank for the most of great old cones. I wonder if they could reproduce them.
The major goals for me would be a coaxial driver with one VC gap for both coils and the grease bearing suspension.
The problem is someone needs to run off 1,000 drivers at a time to get the price down to reasonable.
Maybe parts Express could be encouraged to get into the re-creation market.
... in a compression driver format. Room temperature of course, as I don't want to fool around with any complex refrigeration equipment. This may take the form of some kind of ceramic material "printed" on the voice coil former probably. Special amps would be needed to drive the resultant low Z coils, but theoretically you would'nt need any more power than an i-pod. I would like to hear some of these things first before I put any money down, as there's always the possibility that some old character will say: "The old copper voice coils sound better".
Paul
You need the resistance to sound OK.
To prove this to yourself just build a (real) current source amplifier and give it a listen. You will hear every peak caused by mouth reflections and I predict you will not care for it.
DJK
Nelson Pass presented an experiment to convert any amp to a current amp by using a relatively large series resistor in line with the speaker. This alone was enough to keep this concept out of consideration for people with low powered tube amps, where every Watt counts (like me with my triode wired ST70). I don't think this is what you meant by "build a real current source" amp though, but rather actually building one of N.P.'s SS designs employing the concept. I never even got as far as the big series resistor, and I'll happily take your word for the CCS source amp being a horn mismatch. But if someone else builds one, I'd happily give it a listen, just like the super conducting VC's.
"Let someone else do it!": H. Simpson's slogan from his mayoral bid.
Paul
Jensen field-coil drivers and Jensen coax drivers (and yes as fc versions as well)
?A house inside the side of a hill. covered top and three sides by earth
One half of the house to be sound-room right to the back with.... Folded over horns for bass made of fibre-crete, goop-sealed and surrounded by earth, flat to 10Hz, retimed to match a coned horn 10-12" mid-bass coupler, to 3-400hz, wide-range CD horn to about 6khz and a tweeter horn all re-timed.
OR the bass horns and a tractrix/voight WR horn with one or two Mangers per side, plus a super tweeter horn.
All actively driven with STEEP x-overs. 24bit 192khz room DSP and Eq.
Non-rectangular expanding room. A bit like a horn.Rears? two by two corner mounted, tall square-plan divided diagonally separate enclosures with 15" 604's or Tannoys (OR Mangers) and a 15" bass driver per enclosure. DSP'd room and Eq, steep 2-way bass/upper bass xover (with a difference in digital delay to each corner on L minus R/Hafler/Dynaquad and) fed direct to two stereo amps for SACD.)
NB The two DC's in each corner should be switchable to be OOP with each other - to create a diffuse source above ~ 200hz. This for movies and Dynaquad. In-phase for multi-channel music.
Lots of diffusion and enough absorption.
Hopefully a 4-chair wide sweet-spot with the centre 2-seater sofa being best! I wish.
Not gonna happen, as I don't buy lottery tickets!
Note that a post in response is preferred.
Warmest
Timothy Bailey
The Skyptical Mensurer and Audio Scrounger
And gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
Edits: 05/30/12
Compression bass drivers that don't cost as much as cars.
Yes a $500 neo 555
I bet most people who dream of WE555 have no idea how it sounds :) I heard that chinese we555 copies sound nothing like originals. I wish that instead of copying they would create better drivers than the old dreck. Drivers purposely made for audio with 5-10 watt power handling for compression drivers and 10-50W for woofers. True HE units not made for pro applications and 10000W power handling. Something competing with ALE , Goto , Vitavox with somewhat accessible prices . They can't be too cheap. Something around $1000 a piece to keep production profitable and guarantee some quality.
Edits: 06/10/12
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