Whizzer Cone for Improved High Frequency Dispersion 4 oz. High Energy Magnet .75" Vented High Temperature Aluminum Voice Coil SPECIFICATIONS Power Handling 30 Watts Freq. Response 77 - 20,000 Hz (5dB) Sensitivity 88dB (1 watt, 1 m) Input Impedance 4 Mounting Depth 1.3125"