The V5xe is a beast - It supposedly fully-balanced and has 16 high-current output devices per channel and a FET input stage. It will do 150 watts continuous into 8 ohms and 300 watts continuous into 4 ohms and weighs 55 lbs. While the Yamahas aren't super power hungry on paper, they really opened up in our largish living room compared to the 100W/ch ICE powered amp I had before. I am not an engineer but would imagine there's some similarities between the Ayre and the original Japanese muscle amps the NS1000ms were designed around. Being balanced, I can have the amp near the speakers and run 30' of xlr cable back to the PSAudio preamp and not worry about the signal picking up noise.