Name: Q-SYS SB-15121 Single 21-inch 1500-Watt Cinema Subwoofer
Brand: QSC
SKU: SB-15121

Description

Q-SYS SB-15121 Single 21-Inch 1500-Watt Cinema 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-inch transducer
Frequency range extends to below 25 Hz without the need for B6 EQ filters
DCP, DCM and SF-3 signal processors optionally available

Specifications:

Frequency Range:

(-6 dB, half space): 23.8 Hz - 250 Hz
(-10 dB, half space): 21.5 Hz - 250 Hz

Maximum Output:

Calculated Peak at rated power: 137 dB SPL
Calculated Continuous: 131 dB SPL

Impedance: 4 ohms nominal
Maximum Input Power:

100 hours of 6 dB crest factor pink noise, 25 Hz–250 Hz: 1500 W continuous
2 hours of 6 dB crest factor pink noise, 25 Hz–250 Hz, AES method: 2500 W continuous

Recommended Amplifier Power:

3400 W continuous maximum / 1200 W continuous minimum

Sensitivity:

99 dB, 40 Hz–100 Hz, at 1 meter, half space

Nominal Coverage: Omnidirectional (80 Hz)
Transducers:

One 21-inch (533 mm) high efficiency subwoofer transducer featuring a vented 6-inch (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 parallel 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