GSB12 12" In-Ground Landscape Subwoofer 400W 100V TanThe JBL GSB12 in ground 12 inch landscape subwoofer augments the low frequency performance of JBL GSF full range landscape speakers to provide rich, full range sound in lawn and garden areas of hospitality, corporate and retail spaces. The GSB12 focuses on fidelity, with true subwoofer extension down to 35 Hz and a steep, multiple slope lowpass filter for superior sound. Its premium grade, 200 watt subwoofer band transformer allows use in 70V 100V