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The Polk hts 12 subwoofer enhances home theater and music listening with powerful Deep bass. It Features a long-throw dynamic balance 12” driver, patented power port technology and a state-of-the-art 400W class D amplifier. Easily to access controls for volume, low pass filter, and phase correction. Connect via LFE (unfiltered/ low pass disabled) or stereo line level RCA inputs.