The BR-15B is the entry level subwoofer in the BR Series, featuring a purpose designed, high power dual voice coil 15" bass driver, mounted in an Ohm S.A.L.T. (Symmetrical Air Load Technology) enclosure. This subwoofer can be used in stereo as a 2 x 4 ohm enclosure or as a mono 8 ohm. An optional passive crossover allows for simple system configurations without additional amplifiers. Optional Hardware: TP-1 Connector Option: EP-5A, Technical specification   Data sheets are being prepared, more information on request