Like many other Philips home-theater-in-a-box systems, the Philips HTS6500/37 uses patented technology to simulate surround sound without the clutter of having five seperate speakers. In this case, "SonoSound" technology simulates 5.1 surround sound with only two speakers "by positioning independent drivers at precise angles," with a total output of 500 watts. This system features a seperate subwoofer, an AM/FM tuner, an input to connect to your MP3 player via the headphone jack, and USB input for flash drives and other portable media. The DVD player upscales via HDMI at 1080i and 720p.