Hey @jazznut, the wall in question to which the turntable is mounted to is:
- Load bearing
- Built with studs on 12" centers with plentiful crossbracing
- Surfaced with 5/8" drywall glued over 5/8" OSB
The 43’x70’ suspended floors of our hundred+ year old 3 story brick building are supported only at their perimeter and along a central line of 8"x8" Douglas Fir piers and joists which bisect the 70’ length. The first floor is wide open commercial retail space with our loft occupying the second floor and about half of the third. So we are left with otherwise unsupported 22’x70’ spans of (saggy) these suspended floors. Even with my rack backed up against a wall in the media room which sits directly along that load bearing central pier and joist row, the wall in question is MUCH less prone to seismic disturbance than the nearby floor.
As for my Grand Prix Audio Brooklands turntable wall mount install, well there is no glass to be found anywhere in it’s construction- LOL! Click through to the link I’ve provided to the stealthy custom install of the wall mount and see specifically why I chose it over a more generic Target, Apollo, Rega, etc welded steel and MDF shelf wall mount. I can assure you that the GPA wall mount’s decoupled composite sub-chassis and tensioned stainless steel rod design along with the upgraded GPA Formula carbon & kevlar isolation shelf minimizes any tendency towards resonance.