Klipsch Sub-12HG Synergy Series 12-Inch 300-Watt Subwoofer with High Gloss Trim (Black) (Discontinued by Manufacturer) The item is non-returnable Affordable 12-inch down-firing woofer produces best-in-class deep bass and output Precision matched BASH amplifier delivers 650 booming watts of dynamic power (300 watts RMS) Significantly extends the bass range, dynamics & performance of virtually any audio or home theater system Features line-level (RCA) inputs & speaker-level inputs for connection to any audio system,Frequency Response: 24Hz-120Hz +/- 3dB; Auto-on/off, variable low-pass filter, switchable 0-180 phase control and level adjustment for precise integration with any audio system.