SELENIUM D3305TI Driver Protection Device Specifications: Power handling: 150 watts (with xover, 800 Hz, 12 dB/octave) VCdia: 3" Impedance: 8 ohms Frequency response: 500-20,000 Hz (no crossover) SPL: 108 dB 1W/1M Magnet weight: 57 oz. Dimensions: 6.9" dia. x 2.87" D, four bolt holes are spaced on a 4" diameter. Specifications: Power handling: 150 watts (w/xover, 800 Hz, 12 dB/octave) VCdia: 3" Impedance: 8 ohms Frequency response: 500-20,000 Hz (no crossover) SPL: 108 dB 1W/1M Magnet weight: 57 oz. Dimensions: 6.9" dia. x 2.87" D, four bolt holes are spaced on a 4" diameter.