Powered Studio Subwoofer The S8.4 powered studio subwoofer builds upon KRK’s legacy for sonic accuracy in a compact form factor. The custom-voiced, glass-aramid woofer delivers 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 S8.4 subwoofer with KRK or another studio monitor delivers an optimized mixing and listening experience with extended low end, while the exclusive bypass-control feature provides full range audio to the monitors without switching off the subwoofer. KRK’s S8.4 subwoofer doesn’t just deliver precise bass and a rich feature set: it’s the next dimension in subwoofer performance.
| Configuration | Front Loaded, Vented Subwoofer | Front Loaded, Vented Subwoofer | Front Loaded, Vented Subwoofer | Front Loaded, Vented Subwoofer |
| System Type | Active Subwoofer | Active Subwoofer | Active Subwoofer | Active Subwoofer |
| Low-Frequency | 8″ Glass Aramid Composite Woofer | 10″ Glass Aramid Composite Woofer | 12″ Kevlar® Aramid Composite Woofer | 12″ Woven Kevlar® High Performance Woofer |
| Frequency Response | 34.5Hz – 133Hz | 30Hz – 110Hz | 26Hz – 97Hz | 29.2Hz – 160Hz (L/R inputs), 29.1Hz – 211Hz (LFE input) |
| Max Peak SPL | 112.8 dB | 117.2 dB | 119.9 dB | 123 dB |
| Amplifier | Class D | Class D | Class D | Class A/B |
| Power Output (Continous) | 109 Watts @ 1% THD+N @ 46Hz | 160 Watts @ 1% THD+N @ 44Hz | 220 Watts @ 1% THD+N @ 44Hz | 400 Watts @ 1% THD+N @ 100Hz |
| Signal to Noise Ratio | 92 dB | 92 dB | 92 dB | 92 dB |
| Amplifier Distortion (THD + N) | ≤ 0.1% @-3dB Of Max Power Output 35Hz-133Hz | ≤ 0.12% @-3dB Of Max Power Output 31Hz-110Hz | ≤ 0.3% @-3dB Of Max Power Output 29Hz-97Hz | ≤ 0.1% @-3dB Of Max Power Output 20Hz-200Hz |
| Input Impedance | 9.4 KΩ Balanced, 9.2 KΩ Unbalanced | 9.4 KΩ Balanced, 9.2 KΩ Unbalanced | 9.4 KΩ Balanced, 9.2 KΩ Unbalanced | 10 KΩ Balanced or Unbalanced |
| Ground Lift | On/Off | On/Off | On/Off | On/Off |
| HPF Bypass | With Footswitch Only | With Footswitch Only | With Footswitch Only | With Footswitch Only |
| Footswitch | Optional | Optional | Optional | Included |
| Indicators | Power/Standby | Power/Standby | Power/Standby | Power, Protection, Limiter |
| Input Connectors | XLR L/R, 1/4″ TRS L/R, RCA L/R, 1/4″ Footswitch | XLR L/R, 1/4″ TRS L/R, RCA L/R, 1/4″ Footswitch | XLR L/R, 1/4″ TRS L/R, RCA L/R, 1/4″ Footswitch | Balanced XLR for Left & Right inputs |
| LFE Input | N/A | N/A | Balanced TRS | Balanced XLR |
| Output Connectors | XLR L/R, 1/4″ TRS L/R, RCA L/R | XLR L/R, 1/4″ TRS L/R, RCA L/R | XLR L/R, 1/4″ TRS L/R, RCA L/R | Balanced XLR for Left & Right |
| AC Power Input | 100VAC-240VAC | 100VAC-240VAC | Selectable 110V-120V / 220V0240V | Selectable 110V-120V / 220V0240V |
| Enclosure | 15 mm and 18 mm Reinforced MDF | 15 mm and 18 mm Reinforced MDF | 18mm Reinforced MDF | 18mm & 36mm Reinforced MDF |
| Finish | Black Vinyl Wrap, Baffle – Black Paint | Black Vinyl Wrap, Baffle – Black Paint | Black Vinyl Wrap, Baffle – Black Paint | Textured Paint |
| Hardware | EVA Isolation Pad | EVA Isolation Pad | EVA Isolation Pad | N/A |
| Dimensions (H x W x D) | (H x W x D): 11″ (279 mm) x 16.125″ (410 mm) x 11.5″ (292 mm) | (H x W x D): 13.4375″ (341 mm) x 18.875″ (479 mm) x 12.1875″ (310 mm) | (H x W x D): 16.375″ (416 mm) x 23.875″ (606 mm) x 14.375″ (365 mm) | 20″ (508 mm) X 20″ (508 mm) X 22.48″ (571mm) |
| Weight | 26.5 lb. (12 kg.) | 35 lb. (15.88 kg.) |
