Have had a hard time making the amp even get warm, but I pushed pretty hard on Into the Storm and the last 20 mins is pretty action packed with regards to active audio. Left and right channels got warm, but the middle channel for the center was still pretty cool. I'd expect the two front towers to be more power intensive.
Impressed so far with the amp sound and performance, especially when you consider what they sell for.
65" VT50 / BDP-S7200
Denon AVR-4520CI / Emotiva XPA-3
Klipsch RF82 II and RC62 II / Hsu VTF-15H (2)
Directv HR44-200 / HR24-500