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In Reply to: Thanks, excellent suggestions posted by tonemaniac on December 22, 2004 at 03:04:48:
Yes, I've worked with both. The main V/T board on my preamp is carbon /kevlar interleave. The subchassis construction on my power amp is multilayer woven kevlar with random glass core. I went with kevlar/glass for the subchassis as I wanted something non-conductive as I have 1100 volts DC floating around in there.This aside, sonically and aesthetically and everything else - ically (except financially) I prefer the results with the multilayer carbon and hand tuning.
It aint cheap - the chassis for my power amp cost me around $2k altogether.
Regarding your filled epoxies etc - the key here is the propagation velocity through the composite material. Diamond's propagation velocity is the highest of any "bulk" material - only exceeded by nanotubes. Next highest are the other ultrahard ceramics like sapphire. The propagation velocity of the composite is dependent on both the filler and the epoxy. Epoxy is very low - down with the other plastics. Kevlar is not much higher than other plastics so the admixture with kevlar will bring your resonant frequncy right back into the audible spectrum. Of course you will get some damping but I'm not sure that it's an ideal solution.
There is some evidence that boron fibre composites give a high propagation velocity with a degree of internal damping but I have no direct experience with these materials. On paper boron fibre reinforced magnesium looks an ideal material but all the information on it is classified by your government. Apparently the armour on Blackhawks is made of this.
Follow Ups:
was there a specific off-ness like a resonant peak or a generalized murkiness ? I wonder if there is a simple but brilliant fix such as suspending a small brass plate from the underside of the case, or a thin brass (or titanium, or copper) sheet between the steel and the C/F. I get the gut feeling that there is a problematic resonant interaction between the C/F Epoxy combination and the case material + geometry that could be reshaped. There is a shop in the South, Kentucky comes to mind, where they'll custom fab tungsten and tungsten/copper sinters, last time I spoke with them the minimum order was $300. Way hard and way dense.
Flat panels suck. CF clad flat panels suck worse. So many resonant modes, so much energy return. The mass of the metal serves to bring the resonances down into peak audio range.You are much better off using straight CF sandwich construction and applying a small amount of damping. By the time you tame the flat panel metal combination it is totally lifeless.
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