Model 25 mm / 1″ tweeter Diameter 25 mm / 1″ Power handling (RMS/max.) 50 / 80 Watts Impedance 4 Ohms Efficiency 87 dB Frequency Response 4 kHz – 20 kHz Voice coil 25 mm / 1″ copper Mounting Ø 44 mm / 1.73” Mounting depth 22 mm / 0.87” Resonance frequency (Fs) 1460 Hz