Yamaha 5.1 TSS-1W Dolby Digital/DTS Surround Sound Computer Speakers (6 Speaker, White) Includes amplifier/processor, 5 satellite speakers, and 1 active servo-powered subwoofer Built-in Dolby Digital and DTS (Digital Theater Systems) surround processing 48 watts RMS of total power 5.1-channel, 4.1-channel (game surround), and stereo speaker modes 1-year warranty on parts and labor