ONKYO TX-NR900 THX Select 7.1-Channel Digital Surround Receiver (Discontinued by Manufacturer) THX Surround EX and THX Certified Dolby Digital, Digital-EX, Dolby Pro Logic II DTS, DTS-ES Discrete/Matrix 6.1, DTS Neo - 6 110 Watts per channel into 7 surround channels through 8 ohm, 20 Hz-20,000Hz WRAT (Wide Range Amplifier Technology)