Model 2-way coaxial speakers for active use Diameter 165 mm / 6.50″ Power handling (RMS/max.) 150+50 / 300+100 Watts Impedance 4 + 4 ohms Efficiency 96 dB Frequency Response 150 Hz – 20 kHz Tweeter 25 mm / 1″ PEI Mounting Ø 147 mm / 5.79″ Mounting depth 86 mm / 3.39″