Hi Yecora

Welcome to the forum.

Meridian DSPs will only turn on/off in response to a comms signal (or remote control), not the digital audio signal.

In the scenario you describe, there would be no way to control all of the DSP speaker volumes unless each was daisy chained, or a 511 patch box was used. You would always need comms cables in some configuration between each of them, and one DSP set as Controller and Master (the rest to slave from this).

No sure what you would do about level calibration either, as that is normally handled by the M processor.

Does the Datasat send out single channels of digital audio on each SPDIF? I suppose you could run each into the relevant DSP, but it does all feel like a bad compromise...I think if he has a lot invested in DSPs, he'd be best sticking with an 861, or go for a full system change.

Perhaps others can chime in with suggestions on control/automation systems which may help here?

Cheers

George