I'm pretty sure, that if he plays loud dynamically compressed rock music with that amp, their will be a couple of blown mid range drivers at least.
I agree, but that's depends on where he set his master volume. Higher compressed rock also have much less dynamic peaks naturally so I guess it is thermal issues that you are referring to. Just to recap what Sam has told us so far below:
Speakers: F12's position 11 ft equilateral triangle.
Sitting distance: Let's assume that's the approx distance of the mic when he ran Audyssey
Calculated sitting pos 11ftXSine 60 degrees = 9.53 ft.
F12's sensitivity: 90 dB/2.83W/1M according to Stereophile
Nominal impedance: 6 ohms according to Revel website
Denon AVR Vol: 70 dB +, but let's assume 75 (-5 on the -79.5 to +18 scale)
Denon AVR level: 0dB for R, -0.5dB for L
Assumptions for calculating/estimating power output with Vol set to -5:
F12's nominal impedance 4 ohms instead of the 6 ohms specified by Revel
- SPL at sitting position, one speaker playing, vol set to =75-5=70dB (again, assuming Vol 0 gives 75 dB at the sitting position after Audyssey XT32 auto calibration).
- SPL drop at sitting position, assume 0 room gain = 10.5dB
- SPL corrected to 1 meter = 70+10.5 = 80.5dB
- Power required to produce 80.5 dB at 1 meter, 1 speaker playing = 0.22W (22.5W for 20dB peak)
I am not too sure after calibration watching watch blu-ray movies whether he will get 75dB or 85dB average at his listening position with volume still at 75. If it is 85dB then the calculated 0.22W requirement will jump 10X to 2.2W average, 220W for 20dB peak.
So depending on the material he's playing, we don't know for sure what the SPL he's actually getting at 1 meter from his F12's when he has master volume set to 75 dB.
If highly compressed rock music will have much higher average power requirement at the same volume setting but it also would not have much dynamic peaks. So are you saying the mid range drivers cannot handle a more or less constant power of several watts? Again, I do realize it is more of a thermal issues for such compressed music, but clearly if he keeps the volume below 75 there is just no way the Denon would be delivering any where near 10W per channel average, with no much peaks to worry about for such music. Even ghetto blaster can blast rock music all day without destroying themselves right? I know there is a different explanation for that though.