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If any Meridian Dealer told any perspective customer that he/she could not play $23,000 DSP6000 speakers in their "open" room at volumne higher than 77 for more than 30 minutes, without them becoming so hot, you could not touch the backs, and they would go into "protective mode,"
Dave,

apart from one other poster above, who suspects might have shared the same issue you have, I have never come across this before. I have been to Meridian demo's since 1991 and the gents doing the demo's, upto and including the Bristol show this year, use 80/83/85 volumes as I recall.

OK, this wasn't for sustained periods, but it was in a fairly open or large room everytime.

Even if your room is open, I presume you are not sitting, say, 10m away from the speakers and that you are trying to listen at normal 'in front of system' distances rather than trying to fill an entire space at high spl's?

I still think this can only be a technical issue with the DSP's. Did you try using different units as Master etc as mentioned above? This would help identify whether the issue was caused in one unit and passed to another, or is common to all units.

Rgds,
Nick