HSK 163 - Hertz 6.5" 3-Way Hi-Energy Component System RMS: 300 watts per pair / 150 watts each HV 165L Woofer (61/2), HL 70 Mid Range (3), HT 25 Tweeter (1") Outer diameter: 167 mm, Mounting hole diameter: 146 mm, Mounting depth: 70.5 mm Damped Mesh Fibre Cone Mid Range, Pulp cone mixed with cotton fibre Woofer Frequency response: 40 Hz-22 kHz, Sensitivity: 92 dB/Spl