Apparently even though Slim listens to music really, really loud, movies are a different story for him. I use the non-HP version of the 160 and I can dump everything the Onk can dish out to it without any problem or perceived compression (at least to the level that can be detected by my ear-brain).

BTW, I've confirmed my $700 Onk can dump 150W into each M100v4 simultaneously. I tested at 250Hz for 5 seconds because that's all I needed to take a good measurement. This is at +10 on the gain knob and 25.95V RMS. It can go higher because I think its rails are at 32V but I dare not do it. As for linearity, that's harder to assess because I don't know how linear the changes in the gain knob are (is a 0.5 dB change really 0.5dB of voltage gain or is it 0.52 for example). THD+N and transient response would be good things to characterize but I can't because I just don't have the requisite gear.