Pinnacle Speakers SUBcompact 300 Watt Powered Subwoofer (Black) (Discontinued by Manufacturer) Designed and Manufactured in the USA Super compact at just 9-Inch cube, this tiny subwoofer will fill any room up to about 400 square feet with loud authoritative bass into the low 30Hz range. Front firing configuration is designed for placement in wall units or free standing against any wall. Special features include line level input, speaker inputs, phase control, variable crossover from 50hz-150Hz and proprietary 300 watt amplifier. Auto on/off circuit with LED indicator, volume control