you might want to rethink the idea of bolting to a wall unless it's a solid exterior supporting wall. Interior walls are typically just flimsey 2X4 + wallboard construction, which will flex along with the music's sound pressure against it - especially the bass frequancies. This would cause your whole rack to vibrate, introducing intermodulations back into the source equipment & essentially exciting a closed feedback loop.
Those who have attempted to even wall-mount a turntable shelf onto an interior wall surface can likely attest to the sonic disadvantages of such an approach.
Those who have attempted to even wall-mount a turntable shelf onto an interior wall surface can likely attest to the sonic disadvantages of such an approach.