KRK S12.4 – a 12" active studio subwoofer with a Kevlar/aramid composite woofer, built to extend the low end of a 2.1 monitoring setup.
Adding a subwoofer to a pair of nearfield monitors often creates phase issues and an inconsistent low-frequency stereo image if the crossover isn't matched to the specific monitors in use. The S12.4 addresses that directly – a four-position crossover and a polarity switch give the engineer control over the crossover point instead of forcing a compromise dictated by the monitors' own factory settings.
Matching the crossover to any monitor pair
The four-position crossover (50/60/70/80 Hz) lets you set the split point for the specific monitors on the desk – from small 5-inch nearfields to larger 8-inch models – without an external controller. The input sensitivity switch (standard/high) and the 0°/180° polarity switch give additional tools for eliminating dips or peaks in the transition band between the sub and the mains, which matters for critical listening in a small room.Comparing the mix with and without low end
The bypass function, triggered through an optional footswitch, mutes the subwoofer and routes full-range audio to the mains without physically switching anything off or leaving the mix position. That's a practical way to check whether the low end in a mix will translate on smaller playback systems that don't have a subwoofer – you can flip between the two perspectives instantly without breaking the session.KEY FEATURES
- 12-inch Kevlar/aramid composite woofer
- 220W Class-D amplifier
- Four-position LPF/HPF crossover (50/60/70/80 Hz)
- Sub and HPF bypass via optional footswitch
- 0°/180° polarity switch and input sensitivity control
- Front-firing bass port, reinforced MDF enclosure
TECHNICAL SPECIFICATIONS
- Driver: 12" Kevlar/aramid composite
- Amplifier power: 220W Class-D
- Frequency response: 32 Hz – 139 Hz (±3 dB spec: 26–97 Hz)
- Max SPL: 119.9 dB
- I/O: XLR, 1/4" TRS, RCA (left/right)
- Controls: volume, crossover, input sensitivity, polarity, standby, ground lift
- Dimensions: 416 x 606 x 365 mm (HxWxD)
- Weight: 28.3 kg