Energy ESW-M8 1200 Watt Mini Subwoofer (Black) for $289.99 shipped after promo code EMCJKKF87. Here is a screenshot for your reference. It features a 1200-watt, 8″ woofer and two 8″ passive radiators with ribbed elliptical surround. It measures 9″D x 9″W x 9″H and features 50Hz-200Hz variable low pass filter, 0° – 360° bypass variable phase control, and more. Most places have it for about $333.