5.1-ch Surround Sound System with Soundbar, Wireless Rear Speakers/Subwoofer, and Flat Amplifier. The 280-watt, 5.1-channel surround sound system includes a soundbar, wireless subwoofer and wireless rear speaker kit. (The surround speakers are wired to the rear receiver that transmits wirelessly with the soundbar.) The soundbar contains four speakers one each for the left and right main channels and two for the center channel. Also built into the sound bar is the power amplifier, surround decoding, system controls and the transmitter for the wireless surround speakers.