Denon AVR-2105 Home Theater Receiver with Dolby Digital EX DTS-ES ProLogicIIx Auto set-up feature with microphone analyzes and creates the ultimate sound environment for your living space 90 Watt Equal Power 7 Amplifier Channels ensure optimal sound reproduciton in Dolby Digital and dts formats for crystal clear audio enjoyment Dual channel surround back power amps allow you to achieve clearer sound at the rear of the room Cinema Equalizer balances the high-frequency component in surround sound formats for audio that beings the movie theater experience into your home Customize the receiver for your home theater needs and then store your settings in Personal Memory Plus to ensure the system meets your exact preferences