SB-15121

21-inch Cinema Subwoofer

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Hero front view of a SB-15121

QSC announces divestiture of its Digital Cinema Series product line to Moving iMage Technologies, including the Screen Channel (“SC”), Subwoofer (“SB”), Surround (“SR”), and Screen Channel (“RSC”) product lines. 

For all inquiries, please visit DSCreference.com or contact [email protected]

Array of new Q-SYS PL Series including Line Arrays, Subs, and Loudspeakers

This product has been discontinued. Please check with your Q-SYS regional sales representative for remaining stock availability.

Consider the PL Series performance loudspeakers as a replacement:

  • The PL Series is a portfolio of performance loudspeakers designed to deliver premium sound for Q-SYS systems in a broader range of applications
  • Available in multiple form factors, enabling design flexibility and optimal audio experiences for every unique space

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

Read the SB-15121 application note:  covers the target applications of the SB-15121, as well as advantages and comparisons to other cinema subwoofer designs.

 
SPECIFICATIONS
 		 SB-15121
Frequency Range 1
(-6 dB, half space)
(-10 dB, 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 continuous


2500 W continuous
Recommended Amplifier Power 3400 W continuous maximum / 1200 W continuous minimum
Sensitivity 2 V at 1 meter, half space 99 dB, 40 Hz–100 Hz
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 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 (HWD) inches 48.8 × 30 × 24
Dimensions (HWD) mm 1238 x 762 x 610 
   
Net Weight 231 lb (105 kg)
Shipping Weight 257 lb (114 kg)

1All frequency ranges specified refer to measured half-space response (2 pi).
2Calculated SPL at 1m, (half space, 2 pi), speaker operating at rated continuous power with pink noise within specified frequency range.
3Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz–20 kHz band limiting, 6 dB signal crest factor.

Specifications are subject to change without notice.