The custom-made, Kevlar® woofer delivers ultra-tight, defined bass, while the Class-D power amplifier dramatically increases transient response, control, and punch. The four-position selectable crossover lets you adjust the subwoofer setting easily to your existing monitors. Pairing the S12.4 with KRK or another studio monitor delivers an optimized listening and mixing experience with extended low end, while the exclusive bypass-control feature provides full range audio to the monitors without switching off the subwoofer. The powerful S12.4 subwoofer doesn’t just deliver precise, ultra-low bass and a rich feature set: it’s the next dimension in subwoofer performance. Features 12 Kevlar® Composite Woofer Bass extension to 26Hz with a max SPL of 119 dB Footswitch control enables/disables sub and crossover filter (footswitch not included) Curved design with front-firing bass port for placement flexibility Powerful, lightweight Class D amplification Optimized four-position crossover control Universal connectivity: XLR, 1/4 TRS, and RCA inputs and outputs Polarity and input sensitivity controls 18mm reinforced MDF enclosure provide maximum strength and protection Ground lift switch prevents ground loops Specifications Configuration: Front Loaded, Vented Subwoofer System Type: Active Subwoofer Low-Frequency: 12 Woven Kevlar® Woofer Frequency Response: 32Hz - 139Hz Max Peak SPL: 119.9 dB Amplifier: Class D Power Output (Continous): 220 Watts @ 1% THD+N @ 44Hz Signal to Noise Ratio: 92 dB Amplifier Distortion (THD + N): = 0.3% @-3dB Of Max Power Output 29Hz-97Hz Input Impedance: 9.4 K? Balanced, 9.2 K? Unbalanced Ground Lift: On/Off Low Pass Frequency: 26Hz-130Hz HPF Bypass: With Footswitch Only Footswitch: Optional Phase: 0 or 180 Degrees System Volume: -30 dB to +6 dB Indicators: Power/Standby, Sub On/Mute, HPF Bypass Input Connectors: XLR L/R, 1/4 TRS L/R, RCA L/R, 1/4 Footswitch LFE Input: Balanced TRS Output Connectors: XLR L/R, 1/4 TRS L/R, RCA L/R AC Power Input: Selectable 110V-120V / 220V0240V Enclosure: 18mm Reinforced MDF Finish: Black Vinyl Wrap Dimensions (H x W x D): 18.11 (460mm) X 15.94 (405mm) X 22.64 (575mm) Weight: 66.5 lb. (30.1 kg)