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In the Forum: Audio Discussions
In the Thread: Mastodont DIY Rack: Wall Mount?

Post Subject: Sand vs. SandPosted by Paul S on: 12/1/2013

There are lots of different types of "sand", including various sizes and shapes of the aggregates, not to mention the constituent materials, themselves. I thought that in most cases the idea of in-frame sand is to quench/diffuse "ringing", not ULF. Of course ULF has to be dealt with incrementally, usually by limiting and "tuning" infrastructure travel rather than trying to eliminate it entirely. In this case, the resonant modes might become more "complex" but still effectively better damped than a given "un-treated" spike or spikes that may result from - for instance - tightening screws "too tightly" or too strictly limiting travel in any one mode. Conversely, too much may be lost through simple entropy when damping is over done.

Any "pearlite" I am aware of is pretty damn light! Anyway. it seems like any frame filler should somehow "wick" away and diffuse the usual steel frame "skin" noises, but that same sand (or, whatever...) would be +/- useless for ULF (of course...).

Regarding decoupling the transports, my own Accustic Arts transport already has special built-in "feet" that - apparently - decouple/isolate the machinery well enough on their own; certainly the carefully-located stock unit sounds better than when I "double up" by adding a decoupling platform. My own (self-suspended) Sota TT is similar, but not the same. It sounds its best when mounted on a +/- "ridged" platform, but much closer attention needs to be paid to every aspect of the platform.

Best regards,
Paul S

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