Isolation for DAC/Class D Power Amp

Hi,

There are many threads on isolation, but I have a more specific question. I understand isolation has great benefits for mechanically sensitive devices such as speakers, turntables, CD players and tube equipment. In your experience, do fancy racks, isolation, coupling etc. have any major improvement in sound with (solid state) DACs / Class D Amps. My flooring is very solid: hardwood glued on to concrete, so floor borne vibrations are not really an issue. The only remaining issue is air borne vibrations from the the music itself.

Thanks.