100 Watt/ch Amplifier Featuring Krell iBias Technology.
The Theater 7 Amp uses iBias technology to maintain Class A operation up to 100 watts into 8 ohms for the left, right, and center channels and up to 50 watts for the four surround channels. This provides the critical front channels with high bias current to produce that lush, open Class A sound while also minimizing the heat output and power consumption of the whole amplifier.
More info - http://www.krellonline.com/multi-channel-amps.html