Sonodyne SRT S21 shallow profile subwoofer

The SRT S21 is a shallow profile subwoofer that employs two high excursion 10″ subwoofer transducers to deliver room filling low frequency effects. Multiple SRT S21s may be employed depending on room size. The SRT S21 must be used in conjunction with its dedicated controller unit that also has provisions for level, phase, and frequency control.