" The item is non-returnablebr Affordable 12-inch down-firing woofer produces best-in-class deep bass and outputbr Precision matched BASH amplifier delivers 650 booming watts of dynamic power 300 watts RMSbr Significantly extends the bass range dynamics performance of virtually any audio or home theater systembr Features line-level RCA inputs speaker-level inputs for connection to any audio systemFrequency Response 24Hz-120Hz - 3dB Auto-onoff variable low-pass filter switchable 0-180 phase control and level adjustment for precise integration with any audio system br Klipsch Sub-12HG Synergy Series 12-Inch 300-Watt Subwoofer with High Gloss Trim (Black)"