QSC KS212C Dual 12" Active Subwoofer
The KSub is a dual-12" bandpass design, constructed of premium birch and includes high-quality, low-noise casters. The subwoofer features a threaded pole receptacle for a positive, wobble free connection to a threaded speaker pole (included).
Remote gain control capability is offered via a potentiometer (not included) connected to the on-board Euroblock connector. In an installed application, multiple K Series speakers can be "daisy-chained" for total gain control from a single remote pot. Auto-standby mode is engaged after 5 minutes of inactivity.
| K Series | ![]() |
| SPECIFICATIONS | KSub |
|---|---|
| Configuration | 4th Order Bandpass |
| Transducers Low-frequency |
2 x 12" cone transducers |
| Frequency Response (-6 dB) | 48 Hz - 134 Hz |
| Frequency Range (-10 dB) | 44 Hz - 148 Hz |
| Maximum SPL1 | 130 dB peak |
| Amplifiers | |
| Power Output2 | 1000 W continuous Class D (2x500 W) 2000 W peak |
| Input Impedance (ohms) | XLR / ¼": 40k balanced / 20k unbalanced |
| Controls | Power, Gain, LF Mode (Normal/DEEP™), Polarity (Normal/Reverse), Front LED (On/Off/Limit) |
| Indicators | Power, Signal, Standby, Limit |
| Connectors | Dual balanced female XLR/¼" line level input, Dual Balanced male XLR full range line level out, Remote gain control, Locking IEC power connector |
| Cooling | On demand, 50 mm variable speed fan |
| Amplifier Protection | Thermal limiting, output overcurrent, overtemperature muting, GuardRail™ |
| Transducer Protection | Thermal limiting, excursion limiting |
| AC Power Input | Universal power supply 100 - 240 VAC, 50 - 60 Hz |
| AC Power Consumption (1/8 Power) |
100 VAC, 2.3 A 120 VAC, 2.01 A 230 VAC, 1.13 A |
| Enclosure | |
| Material | Painted birch plywood |
| Finish | Black textured paint |
| Dimensions (HWD) | 26" x 14" x 28.1" (including casters) 665 mm x 356 mm x 714 mm |
| Weight (Net) | 74 lb / 33.6 kg |
| Available Accessories | KSub COVER |
1 For comparison purposes and in accordance with common industry practice, maximum peak SPL specifications are theoretical calculations based upon transducer sensitivity and peak available amplifier power.
2 Independent of limiters and driver protection circuits.

All Specifications Subject to Change Without Notice.

| K Series Amplifier Modules |
| KSub |