Pump up your home entertainment experience with the Philips Home Theater System HTD3509. Exposed speakers drivers offering 300W powerful surround sound and DVD video upscaling to 1080p via HDMI for near-HD images., Philips Home Theater System HTB3509 is the established standard for home theater, Dolby Digital 5.1 redefined the entertainment experience for audiences around the world, With 5.1 channels of high-quality audio, Dolby Digital places you in the center of the action. It expands the left and right traditional stereo channels to deliver an enveloping 360 degrees of sound.