Model 3-way coaxial speakers Power Handling (RMS/max.) 120 / 180 Watts Impedance 4 Ohms Efficiency 92 dB Frequency Response 40 Hz – 20 kHz Tweeter 13 mm / 0.51″ Mylar tweeter Mid Range Speaker 50 mm / 2″ mylar Mounting Ø 152 x 214 mm / 5.98 x 8.43″.