Description Active closed-box subwoofer system Dimensions Height: 340mm (13.4 in) not including removable spike feet Width: 340mm (13.4 in) Depth: 411mm (16.2 in) including grille and controls Allow extra 50mm (2 in) at rear for ventilation Net Weight 25.5kg / 56.1 lb Freq. Response -3dB 22Hz - 31/110Hz adjustable (EQ at A) Freq. Range -6dB at 17Hz and 40/140Hz adjustable (EQ at A) Drive Units Unit 1: 1x 250mm (10 in) dia composite aluminium/paper/Kevlar cone long throw Unit 2: Unit 3: Finish Cabinet: Black Ash Grille: Black cloth Sub Woofer Amplifier Description: Class D with switch mode power supply Power Output: 500W Rated Power Consumption: 75W Input Impedance: 33k ohms Signal Noise: 90dB Functions: Volume level - Low-pass filter frequency - Low-pass filter bypass - Bass roll-off alignment - Auto sense on/standby - Phase 0/180 Inputs: Line In (RCA Phono) Outputs: Line In (RCA Phono, high-passed) Link Out (RCA Phono, parallel to Line In) Low Pass Filter Active 2nd-order, variable cut-off frequency High Pass Filter Active 3rd-order -6dB at 80Hz