User manual QSC AUDIO LF-4215

[. . . ] In the rare event of a transducer failure, this prevents over-excursion of the remaining transducer caused by improper box loading. Large, Fully Radiused Ports (FRP) ensure smooth air flow through the ports, especially at higher power. This prevents potentially audible port turbulence noise. Both internal and external port openings are fully radiused. [. . . ] QSC® is a registered trademark of QSC Audio Products, Inc. "QSC" and the QSC logo are registered with the U. S. Patent and Trademark Office *TD-000141-00* Connections Normal Connection The LF-4215 has barrier strip screw terminals for connection. The terminals accept up to #10 AWG stranded loudspeaker wiring. Use the largest wire size and shortest wire length possible for a given installation. Observe the polarity markings and keep polarity consistent throughout the system for best performance. Normal Connection Example: Parallel Connection of Second LF-4215 The terminals marker SPK2 may be used to connect another LF-4215 in parallel. Connect the wires as shown in the illustration, at right. Note: If the LF-4215's internal wiring has been modified in any way, this may not function. If this is the case, remove the terminal cup and verify the presence of the factory yellow jumper and blue jumper wires; remedy as required or have the loudspeaker serviced. Parallel Connection Example: Individual Transducer Connection (requires modification) CAUTION!Requires removal of terminal cup and cutting of both the yellow and the blue jumper wires that connect the SPK1 and SPK2 terminals. The transducers are wired in parallel inside the enclosure. If individual transducer connection is required, remove the terminal cup and remove the yellow and the blue jumper wires that are connected between the SPK1 and SPK2 terminals. Replace the terminal cup and mark the enclosure with a note of the modification. Individual Transducer Connection Example: LF-4215 Specifications (subject to change without notice) Frequency Range: 38 - 1300 Hertz (±3 dB) 30 - 1400 Hertz useable range (-10 dB) 100° horizontal X 55° vertical at 600 Hertz 134. 5 dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 25 - 250 Hertz. 128. 5 dBA SPL calculated maximum continuous, 1 meter. The dBA scale is typically used to identify sound sources which can cause permanent hearing loss. 4 ohms nominal (8 ohms nominal, LF-4215-8) 800 watts rms (100 hours of 6 dB crest factor pink noise, 30 - 500 Hertz) 1000 watts rms (2 hours of 6 dB crest factor pink noise, 30 - 500 Hertz, AES method) recommended amplifier power capability- 1600 watts rms maximum into 4 ohms (LF-4215) or 8 ohms (LF-4215-8) 99. 5 dB half space, 93. 5 dB full space, 35 - 1000 Hertz, 1 watt, 1 meter Subsonic filter below 30 Hertz, >18 dB per octave, maximum recommended crossover frequency is 1000 Hertz. QSC DSP configurations are available at www. qscaudio. com. Parameters for alternative processing hardware are available upon request. Barrier strip screw terminals accept up to #10 AWG stranded wire. Four terminals: (two INPUT and two PARALLEL OUT). Drivers are internally wired in parallel. [. . . ] This limited warranty is freely transferable during the term of the warranty period. Customer may have additional rights, which vary from state to state. In the event that this product was manufactured for export and sale outside of the United States or its territories, then this limited warranty shall not apply. Removal of the serial number on this product, or purchase of this product from an unauthorized dealer, will void this limited warranty. [. . . ]