Diameter 200 mm / 7.87″ Power Handling (RMS/max.) 150 / 400 Watts Impedance 4 Ohms Efficiency 95 dB Frequency Response 140 Hz – 10 kHz Voice Coil 38 mm / 1.5″ CCA Mounting Ø 182 mm / 7.17″ Mounting Depth 87 mm / 3.43″ Resonance Frequency (Fs) 91 Hz