DCS Series
DCS SB-15121
21" Subwoofer
Part of the DCS Digital Cinema Speaker Series, QSC's SB-15121 subwoofer offers the highest performance available for cinema subwoofer applications. It is designed for use in premiere cinemas and post-production applications where the ultimate in performance is required.
The massive 21" low-frequency transducer features a 6" diameter voice coil in a vented, neodymium magnet structure that is designed to dissipate extreme amounts of heat and allow for excursion that is double that of typical 18" transducers. This ensures cool operation, even at high power levels, increases driver lifespan and decreases power compression at high drive levels.
The large, ported enclosure ensures response to the lowest audible frequency for bass that you can not only hear but also feel. The enclosure is constructed of high quality, heavily braced MDF Panels. Large, fully radiused ports ensure smooth airflow, especially at higher drive levels. This prevents potentially audible port turbulence noise. Both internal and external port openings are flared.
With symmetrical port loading, the bass ports are evenly spaced around the transducer, making internal pressure more uniform across the back surface of the woofer. This prevents the cone from being displaced to one side or another by unbalanced air pressure, reducing the chance of driving the voice coil out of the center of the gap at high drive levels.
Features
- 1500 W, 21" transducer
- Frequency range extends to below 25 Hz without the need for B6 EQ filters
- DCP, DCM and SF-3 signal processors optionally available
An Application Note (PDF 405K) is available that covers the target applications of the SB-1512, advantages and comparisons to other cinema subwoofer designs.
SPECIFICATIONS |
SB-15121 |
|---|---|
| Frequency Range 1 (-6dB, Half space) (-10dB, Half space) |
23.8 Hz - 250 Hz 21.5 Hz - 250 Hz |
| Maximum Output 2 Calculated Peak at rated power Calculated Continuous |
137 dB SPL 131 dB SPL |
| Impedance | 4 ohms nominal |
| Maximum Input Power 3 100 hours of 6 db crest factor pink noise, 25 Hz – 250 Hz 2 hours of 6 db crest factor pink noise, 25 Hz – 250 Hz, AES method |
1500 W RMS 2500 W RMS |
| Recommended Amplifier Power | 3400 W RMS maximum / 1200 W RMS minimum |
| Sensitivity 1 watt/1 meter, half space | 99 dB 40 Hz - 100 Hz |
| Nominal Coverage | Omnidirectional (80 Hz) |
| Transducers | One 21" (533 mm) high efficiency subwoofer transducer featuring a vented 6" (153 mm) copper voice coil on a fiberglass former. High excursion/low distortion design, with extremely high power handling and low thermal and port compression. Neodymium magnet to provide a very high force factor and linear excursion. |
| Recommended Processing | HPF at 20 Hz, minimum 12 dB / Octave slope |
| Connectors | Barrier strip screw terminals accept up to #10 AWG stranded wire. Four terminals; two inputs and two parrallel outputs. |
| Enclosure | Vented enclosure with symmetrical port design, tuned to 25 Hz, constructed of medium density fibre-board and heavily braced. Features vandal resistant woofer mounting bolts. |
| Dimensions (HxWxD) | 48.8" x 30" x 24" (1238 mm x 762 mm x 610 mm) including feet |
| Net Weight | 231 lb (105 kg) |
| Shipping Weight | 257 lb (114 kg) |
2 Calculated SPL at 1m, (half space, 2pi), speaker operating at rated RMS power with pink noise within specified frequency range.
3 Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor.
Specifications subject to change without notice.
