18-inch Cinema Subwoofer

Hero front and back view of a SB-7118

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


  • SB-7118 features a 750 W, 18-inch transducer
  • Frequency range extends to below 25 Hz when used with the correct B6 filter
  • DCM and SF-3 signal processors optionally available
  • Enclosures feature vandal-resistant woofer mounting bolts
Frequency Range 1
(-6 dB, Half space)
(-10 dB, Half space)

22–100 Hz
19–250 Hz
Maximum Output 2
Calculated Continuous

125 dB
Impedance 8 ohms nominal
Maximum Input Power 3
(100 hours of 6 dB crest factor
IEC 268 noise spectrum)
(2 hours of 6 dB crest factor pink
noise, 50–20,000 Hz, AES method)
Recommended Amplifier Power

600 watts continuous

750 watts continuous

1200 watts continuous maximum
Sensitivity 2.83 V at 1 meter, half space 98 dB
Transducers 18-inch (457 mm) 700 watt high-efficiency subwoofer transducers featuring 4-inch (100 mm) copper voice coils on Kapton formers
Recommended Processing LF boost Freq. = 25 Hz
Q = 2.0
Gain = +6 dB
provided by QSC, SF-3 or DCM
Connectors Barrier strip screw terminals accept up to #10 AWG stranded wire
Enclosure B6 alignment, vented enclosure with symmetrical port design, tuned to 25 Hz, constructed of MDF and heavily braced. Features vandal-resistant woofer mounting bolts.
Dimensions (HWD) inches 30 × 35.75 × 20.3
Dimensions (HWD) mm 908 x 762 x 516
Weight 162 lb (73.3 kg)

1All frequency ranges specified refer to measured half space (2 pi) response.
2Calculated SPL at 1 m, (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.