Full Range and Beyond. With the Class A dual (mirror image) input and voltage amplifier stages the T600.4 plays every frequency from 5Hz - 100kHz with 99.95% accuracy for amazingly lifelike and dynamic sound. The Class A/B current amplifier stage keeps the efficiency reasonable. At 150 Watts X 4 continuous per channel the T600.4 is an outstanding full range power amplifier with ultra low noise and distortion for a crazy bi-amped front stage or traditional front and rear use. It can also run in 3 channel mode for 2 + subwoofer setups, or center channels. At up to 300 Watts X 2 continuous in dual mono mode and with its super high damping factor you can give your full range speakers everything they could ever want or use it as a high quality subwoofer amplifier that will put down over 600 Watts RMS to a dual 4 ohm (DVC) subwoofer.