User manual QSC AUDIO SB-15121

[. . . ] Use only hardware which is rated for the loading conditions of the installation and any possible short-term unexpected overloading. Consult a licensed, professional engineer when any doubt or questions arise regarding a physical equipment installation. This product is capable of producing sound pressure levels that can permanently damage human hearing. [. . . ] Customers may have additional rights, which vary from state to state or from country to country. In the event that a provision of this limited warranty is void, prohibited or superseded by local laws, the remaining provisions shall remain in effect. To obtain the most recent version of QSC's warranty statement, please visit www. qscaudio. com. The QSC limited warranty is valid for a period of three (3) years from date of purchase in the United States and many (but not all) other countries. For QSC warranty information in countries other than the United States, contact your authorized QSC international distributor. A list of QSC International distributors is available at www. qscaudio. com. To register your QSC product online, go to www. qscaudio. com and select "Product Registration". Other questions regarding this warranty can be answered by calling, e-mailing or contacting your authorized QSC distributor. All trademarks are the property of their respective owners. 1 Introduction 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. Ensuring 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. 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. [. . . ] Omnidirectional (80 Hz) Barrier strip screw terminals accept up to #10 AWG standard wire. Vented enclosure with symmetrical port design, tuned to 25 Hz, constructed of medium density fibreboard and heavily braced. 48. 8" x 30" x 24" (1238 mm x 762 mm x 610 mm) including feet 257 lb / 114 kg 231 lb / 105 kg 137 dB SPL 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 40 Hz ­ 100 Hz 131 dB SPL 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 40 Hz ­ 100 Hz 4 nominal 23. 8 Hz ­ 250 Hz 21. 5 Hz ­ 250 Hz Recommended Processing Nominal Coverage Connectors Enclosure Dimensions (HWD) Weight Shipping Net Weight 4 SPL and Impedance vs. [. . . ]