Dual 18-inch Cinema Subwoofer


  • SB-7218 features dual 700-watt transducers
  • 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 Peak at rated power
Calculated Continuous

137 dB
130 dB
Impedance 4 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 Hz–20 kHz, AES method)
Recommended Amplifier Power

1200 watts continuous

1500 watts continuous

2600 watts continuous maximum
Sensitivity 2 V at 1 meter, half space 101 dB
Transducers Two 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 48 × 30 × 24
Dimensions (HWD) mm 762 x 1220 x 610
Weight 210 lb (95 kg)

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