Bernard, I linked that paper because as I said it "touches" on the average power point that you're interested in(although it only covered two-channel CDs, rather than the average for multi-channel discs). Note however that its main thrust is the heat sinking required to run continuously for very long periods at 1/8th, 1/3rd or full power. If a unit designed with heat sinking adequate for running full time at an average of 1/8th of full power wasn't adequate for some particular disc, the result would be eventually overheating and a shut-down by the protective circuit. This wouldn't have any relevance to claims of better sound somehow resulting from a more powerful amp, even when operating at moderate levels easily handled by the original amp. There appears to be no technologically plausible basis for that.
