The S12.4 powered studio subwoofer builds upon KRK’s legacy for sonic accuracy and stellar performance. 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.
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  • 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
  • All-steel grill and 18 mm reinforced MDF enclosure provide maximum strength and protection
  • Ground lift switch prevents ground loops


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 KΩ Balanced, 9.2 KΩ 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
Grill Steel Perf
Dimensions (H x W x D) 18.11″ (460mm) X 15.94″ (405mm) X 22.64″ (575mm)
Weight 66.5 lb. (30.1 kg)

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