Powered Subwoofers at Crutchfield.com
Powered subwoofers produce deep bass for your music and powerful low-frequency effects for high-impact home theater.

Powered-Subwoofers.com
Comparison shop dozens of brands of home theater powered subwoofers for providing the deep bass for your surround sound or stereo audio system.

Amazon.com: powered subwoofer
A community about powered subwoofer. Tag and discover new products. Share your images and discuss your questions with powered subwoofer experts.

Subwoofer - Wikipedia, the free encyclopedia
Passive subwoofers have a subwoofer driver and enclosure and they are powered by an external amplifier. Active subwoofers include a built-in amplifier.

Subwoofer, Powered Subwoofers - Polk Audio
Powered Subwoofers that provide ultra high bass performance from PolkAudio.com.