Onkyo TX-NR906 7.1 Channel Home Theater Receiver (Black) (Discontinued by Manufacturer) 145 W/Ch Minimum into 8 Ohms, 20 Hz20 kHz, 0.08%, 2 Channels Driven, FTC Network Capability for Streaming Audio Files and Internet Radio Massive Toroidal Transformer and Two Separate Transformers for Audio and Video Processing Microsoft PlaysForSure Certified and Certified for Windows Vista USB Port for a Mass USB Storage Device (Audio Only)