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.Total Frequency Response :22 Hz → .180 HzDeep Bass for Home Theater and MusicWhether you’re installing a new set of surround or ATMOS speakers, adding a second subwoofer for the ultimate home theater experience, or just need more core-pounding impact from your favorite music, the HTS 12 delivers the powerful bass you crave with its long-throw 12” driver, patented Power Port technology and 400W Class D amplifier.Dynamic Balance DriverFront-firing 12” driver with our patented Dynamic Balance technology is Klippel optimized to provide clean, clear bass, better linearity, lower distortion and greater durability.Patented Power Port TechnologyThe Power Port floor-firing design smoothly transitions air flow from the speaker into your listening area for deep, extended bass impact while minimizing turbulence, distortion, and port noise. At the port tuning frequency, Power Port equipped subwoofers have 3dB less port noise than similarly configured subwoofers without Power Port.Complete ControlBuilt-in controls for variable volume, low pass filter and phase (0/180 degree) for optimum bass levels. Set power toggle to Auto on/off or DC control (12V trigger) for fast and easy on/off power switching in the sub and other home theater equipment—all easily accessible on the back panel.Universal CompatibilityConnect via LFE (unfiltered / low pass disabled) or stereo line level RCA inputs—complements any home theater system (cables not included).American Modern StylingCurved edges offer a sensual yet powerful look that fits with any home decor—available in a stunning black washed walnut finish.Product highlights:bass-reflex (ported) enclosure with down-firing Power Port® for clear, accurate bass12″ front-firing polypropylene woofer200-watt RMS (400-watt peak) Class D amplifierfrequency response: 28-120 Hz (-3dB)RCA line level/LFE (low frequency effects) inputvariable low-pass crossover controlphase switch to acoustically match the subwoofer’s output to your main speakersautomatically powers off when it no longer receives signal from the receiver