Thanks very much. Using your tip, I was able to remove the center plate, and the two machine screws underneath it.

Unfortunately, the top of the unit still seemed to be held in place very firmly. Other than the two machine screws under the small center plate, are you aware of anything else that has to be done to release the top plate?

Living room: 818v3, Audio Research D150, Maggie 1.6
A/V room: 861v8, DSP7200SE L/R/C, 4x DSP320 surrounds, ID41 + Roon, UHD722, Prime+PS