Biamping off the same power supply doesn't increase the power. Passively biamping dosent do anything and I bet your friend would be surprised to learn that he is probably only pushing a watt or two most of the time.
QUOTE="MarcG, post: 1220030, member: 83322"]Something I would like to add that I failed to mention
My friend who biamped is using the Onkyo TX-NR646 100 W/Ch (8 Ohms, 20 Hz–20 kHz, 0.08% THD, 2 Channels Driven, FTC).
He's also only using it 2.0 and he's bi-amping using the extra rear channel. so i'm guessing he's sending 100-150w of power per speaker.
My other friend using the cheap Pioneer receiver and is setup with a full 5.0.
With all channels driven he's most likely only getting 25-40w per channel.[/QUOTE]