I've just come across this old thread now. What a great system you've built Cliff. Some blue-sky thinking going on there! Very impressive.

Re Simon's Q above; I doubt you'd be able to connect multiple DSPs to a Japanese AVR; they're designed to power any speakers connected to the relevant outputs, so I can't see how it could be done, but as anyone can tell you, my tech skills are permanently in first gear.

Cinema: Meridian 271, 3 x DSP640 (behind screen), 4 x DSP320 (in-ceiling), 4 x DSP3100 (surrounds), 2 x AC12 (interface). 2 x Perlisten D12s subs, Lyngdorf MP40 processor. DT 145" 2.35 AT screen. Sony VW870 projector & S-T lens, Lumagen Radiance Pro.
Lounge: Roon, NUC, Kef LS50 Wireless + 2 x REL Gibraltar-2 subs

Meridian owner since 1998