JBL CONTROL 1 ORIGINAL / 300 WATT SPEAKERS (BLACK) High power handling (150 W pink noise) with integral protection circuit network Nominal Impedance : 4 Ohms -- Sensitivity 2: 87 dB SPL, 1 W, 1 m (3.3 ft) Frequency Response ( 3 dB): 120 Hz to 20 kHz High-Frequency Transducer : 19 mm ( in) polycarbonate dome tweeter (C1002) Low-Frequency Transducer : 135 mm (5 in) Cone Transducer (C1003)