User manual QSC AUDIO SB-5218 DATASHEET 06-20-08

[. . . ] SB-5218/SB-7218 Features · SB-5218featuresdual500Wtransducers · SB-7218featuresdual700Wtransducers · requencyrangeextendstobelow25Hzwhenusedwith F thecorrectB6filter · DCMandSF-3signalprocessorsoptionallyavailable · Enclosuresfeaturevandal-resistantwoofermountingbolts · HXTMapprovedforprofessionalcinemaapplications T Cinema Subwoofers Part of the DCS Digital Cinema Speaker Series, QSC's SB-5218 and SB-7218 subwoofers offer a unique solution that addresses the requirements of digital motion picture soundtracks. [. . . ] Undercut pole pieces provide a symmetrical magnetic gap, reducing second harmonic distortion. Enclosures are constructed of high-quality MDF panels and feature individual woofer chambers. The separate chamber for each transducer makes the enclosure stronger, provides rigidity, and prevents cone overexcursion in the rare event of a driver failure. Enclosure "loading" is not lost for the remaining transducer. Large, fully radiused ports ensure smooth airflow, especially at higher drive levels. With symmetrical port loading, the bass ports are evenly spaced on each side of the transducers, 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. Specifications Frequency Range1 -6 dB half space -10 dB half space Maximum Output2 SB-5218 SB-7218 24 Hz ­ 100 Hz 19 Hz ­ 250 Hz 22 Hz ­ 100 Hz 19 Hz ­ 250 Hz Calculated Peak at Rated Power 135 dB Calculated Continuous Impedance Maximum Input Power3 800 W RMS 1000 W RMS 129 dB 4 nominal 137 dB 130 dB 4 nominal 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 1200 W RMS 1500 W RMS Recommended Amplifier Power 1600 W RMS maximum Sensitivity 1 watt /1 meter, half space Transducers 99. 5 dB Two 18" (457 mm) 500 W high efficiency subwoofer transducers featuring 4" (100 mm) copper coils on Kapton formers 2600 W RMS maximum 101 dB Two 18" (457 mm) 700 W high efficiency subwoofer transducers featuring 4" (100 mm) copper coils on Kapton formers Recommended Processing Connectors Enclosure LF boost frequency = 25 Hz, Q = 2. 0, Gain = +6 dB provided by QSC, SF-3 or DCM Barrier strip screw terminals accept up to #10 AWG stranded wire B6 alignment, vented enclosure with summetrical port design, tuned to 25 Hz, constructed of MDF and heavily braced. Features vandal resistant woofer mounting bolts 30" x 48" x 24" (762 mm x 1220 mm x 610 mm) 205 lb (93 kg) 210 lb (95 kg) Dimensions (HWD) Weight ­ Net 1) All frequency ranges specified refer to measured free field response (half space, 2). [. . . ] Patents may apply or be pending. 1675 MacArthur Boulevard · Costa Mesa, CA 92626 · Ph: 800/854-4079 or 714/957-7100 · Fax: 714/754-6174 SB-5218/SB-7218 Spec Sheet ­ 06/20/08 qscaudio. com [. . . ]