agear,
I think the state of our socialized knowledge is something like this:
- There are plausible reasons why vibration reduction could work in solid state gear. A) Microphonics in the components, or B) You are actually hearing the preamp/DAC, etc. mechanically vibrate.
- There are known issues with tubes and things that move like turntables and speakers.
- There is almost no known electrical or acoustical measurements of vibration control being needed, or improving solid state gear in the audio/home environment.
- As far as I know, the only "evidence" is from listener impressions. This doesn't make it false, it just means we have not progressed from subjective to objective yet. I hope that comes in the future.
@georgelofi Point about being 100% sure your speakers are not moving in 3D space is right on. Not only must you isolate the vibrations of the cabinet from any other surfaces such as the floor, you have to ensure the cabinet doesn’t rock in response to the woofer movement, causing a dopler like effect to muddy the sound.
Best,
Erik