Model Sound quality midrange speaker Diameter 80 mm / 3.15″ Power handling (RMS/max.) 50 / 80 Watts Impedance 4 Ohms Efficiency 89 dB Frequency Response 140 Hz – 4 kHz Voice coil 25 mm / 1″ Cone anodized aluminum Magnetmaterial Neodymium Mounting Ø 77 mm / 3.03″ Mounting depth 34 mm / 1.34″ Resonance frequency (Fs) 114 Hz