Sonance Pro Series PS-S210SUBT Shallow Install Subwoofer 10" DualThe Sonance Professional Series PS S210SUBT is a dual 10 inch bandpass subwoofer engineered with an extremely shallow profile so it can be deployed in commercial applications where conventional subwoofer cabinets won't fit under booths and banquettes, on the side of rafters or beams, on walls behind millwork, or under ceilings. Two 10 inch drivers in a bandpass enclosure deliver 3dB extension from 44 Hz to 132 Hz with 10dB extension down to 34 Hz,