The speakers included are two 150 watt front speakers with a 3-1/2" woofer and 3/4" tweeter, a 150 watt center speaker with a dual 3" woofers and a 3/4" tweeter, two surround speakers with a 3" woofer and 1/2" tweeter, and a powered subwoofer, which has a 6.5" woofer and 150 watt power output. All speakers combined put out 900 watts of power. The DVD receiver has a 5 disc changer with progressive scan and is capable of playing DVD, CD, DVD-Audio, SACD and most other disc formats and the receiver is also compatible with DivX, Dolby Pro Logic II and DTS digital surround and there are 8 built in surround programs. It is also iPod and XM satellite radio ready, with optionial dock and tuner. Yamaha's Advanced Yamaha Active Servo Technology (Advanced YST) cancels impedance to give speakers a more linear motion and better sound performance. It has an HDMI input and output with 1080i/720p upscaling as well as two RCA inputs and one output.