Polk Audio TL1600 5.1 Compact Home Theater System with Powered Subwoofer Time Lens Technology-The acoustic centers of the tweeter and mid-bass driver are located in the same plane for superior imaging TL1 Satellite Aperiodic-Tuned Rear Port enables better blending with a subwoofer TL1 Center Channel Tuned Rear Port maximizes the low end response of the dual driver design for superior blending with the satellites and the subwoofer Downward Firing Powered Subwoofer. A compact vented enclosure with an 8" long-throw Dynamic Balance poly composite driver Built-In 50 Watt Continuous/100 Watt Peak Amp with active crossover offers the control you need for real home theater thrills and big, musical, accurate bass