JBL CONTROL SB-2 Stereo Input Dual Coil 10" Subwoofer Components: 250 mm (10 in) dual voice coil transducer. Stereo inputs with high-pass outputs for Satellite speakers. Slot-load vented band pass design. Complemented full range control contractor Series systems. High sensitivity: 100 dB, 1 w, 1 M.