Beyma Replacement Diaphragm for CP21, CP22 and CP25 Compression Tweeters, 8 ohm Voice coil 1.5" (37.6 mm) edgewound aluminium ribbon. Great power handling: 25 w RMS / High Sensitivity: 105 dB Frequency range: 3.5 - 20 kHz / Recommended crossover: 5 kHz or higher Impedance: 8 ohms. Minimum impedance: 8 ohms.@ 9 kHz D.C. Resistance: 6.1 ohms. Sensitivity: 105 dB / 1w @ 1m.