Excerpt: . The NX-BAS-500 subwoofer has a 12" front firing woofer with a rear facing port. It measures 18"x14.75"x17.75" (HWD), including feet and grill, and tips the scales at just 35 pounds. The amp is Class D and rated at 500 watts "Dynamic Power", whatever that means. The quoted frequency response is 18Hz-120Hz. There is a 2 year warranty, which is on the generous side given the selling price.