nominal diameter 100 mm / 4“ woofer & 20 mm / 0.79“ tweeter compatibility Mercedes-Benz / BMW impedance 4 Ohm / ohms frequency response 70 Hz – 22 kHz cross frequency 6000 Hz power handling (RMS) 60 Watt / Watts power handling (max) 100 Watt / Watts efficiency (SPL) 87 dB resonance frequency 82 Hz Xmax (p2p) 7 mm / 0.28”