Thx-certified select theater Reference power 100 W/Ch. (8 ohms, 20 Hz-20 kHz, 0. 08% THD, 2 Ch. Driven, FTC) and 225 W/Ch. (6 ohms, 1 kHz, 10% THD, 1 Ch. Driven) Dolby Atmos and DTS: x playback through 5. 2. 4 or 7. 2. 2 channels and now with 11. 2 multichannel pre-outs and processing for 7. 2. 4-Ch playback with an external stereo power amp Your Onkyo receiver can now be part of your existing Sonos home sound system, or the start of a new one. Instantly upgrade the music streaming capability of your home theater receiver with Sonos connect and a free firmware update.