I have the A1400-8 driving seven speakers with two M80s being in the fronts. Even with full power into the 80s (i.e, no subs), there is no clipping whatsoever at volumes that most would dare not to subject their ears. The clarity and dynamic headroom with this amp are superb, and I have the sense that it is not even breaking a sweat, even when I was trembling while testing it at high levels.
I haven't been able to find any sort of ceiling either, although I chickened out at 107 db. It didn't seem like the amp was even beginning to work hard, i.e., there was a lot more clean usable gain from the preamp available but I was just not in the mood to pull the trigger (i.e., for experimental purposes only, 90-100 db is normally as loud as I go when I want to go loud).
