Hi cyclopse,
My Entreq expert advised me that the ground boxes do benefit from isolation feet so I have followed his advice but economically. The Silver Tellus and the Olympus Tellus in the photo have some old RDC cones under them from my earlier days.
The Poseidon which does the speaker negative terminal grounding and the SIA 025 and can be seen on Bonzo's zero-distortion web site from the Vitus/Dave Berning comparison he did at my place a little while ago also has three RDC cones for support. The second Silver Tellus under it has the smaller HRS footers.
The purpose is to isolate the boxes and drain any resonance from the boxes. I can't claim to have ABed them with and without and really just followed the expert advice.
All the sources, amp and Aspect passive power conditioner have Stillpoint Ultra 5s, SSs and the small Stillpoints. The turntable has the large HRS Nimbus couplers which seem to suit it better than the Stillpoints, The Kipod Signature passive speakers have the Ultra 5s.
So all well damped and with the Entreq grounding a combination of mechanical and electrical support to combat sources of vibration and pollution.
The foregoing combination has undoubtedly made a real improvement to my system's sound quality and the latest Athena rack has improved it still further in the ways described in my earlier post.
Hope that is helpful.
Regards,
Barry