Onkyo HTS680S 6.1 Channel Component Home Theater Audio System (Silver) (Discontinued by Manufacturer) Power Output - 100W/Channel; 750 Watts Total (100 Watts x 6 channels) and 150 Watts at the subwoofer Built-in Dolby Digital EX, DTS-ES, DTS Neo - 6, Dolby Pro Logic IIx processing, for surround sound from DVD, VHS, and stereo sources THD (Rated Power) - 0.08 percent (all channels) / Frequency-Response - 20 Hz-20,000Hz 6-channel amplifier (100 watts x 6) Wide Range Amplifier Technology WRAT - delivers amplification consistently throughout the frequency-response range