User manual QSC AUDIO LF-4215

[. . . ] Close Coupled Woofers (CCW), with its tight spacing between woofers, improves coupling and keeps coverage angles wide over a greater frequency range than more widely spaced designs. The two custom 400 watt, 15" transducers were developed especially for cinema use. They feature extremely large 4" (100mm) voice coils and a multi-vented pole piece to ensure cool operation, even at high power levels. Cooler temperatures increase transducer lifespan and decrease the problem of power compression at high power. [. . . ] Any missing, corroded, deformed or non-load rated component could significantly reduce the strength of the installation, placement, or array. Any such condition severely reduces the safety of the installation and should be immediately corrected. 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. Mounting points for high or mid-high system TD-000141-00 rev. E © Copyright 2003, 2004, 2007, QSC Audio Products, Inc. Patent and Trademark Office *TD-000141-00* Connections Normal Connection The LF-4215 has barrier strip screw terminals for connection. 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. 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. 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. 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. Parameters for alternative processing hardware are available upon request. For independent transducer connection, remove blue jumper wire and yellow jumper wire on internal-side of terminal cup and mark enclosure accordingly. Two 15" (381mm) high efficiency low frequency transducers featuring vented 4" (100mm) copper voice coils on Kapton® formers. [. . . ] 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. To obtain the most recent version of QSC's warranty statement, please visit www. qscaudio. com. Contact us at 800-854-4079 or visit our website at www. qscaudio. com. Contacting QSC Audio Products Mailing address:QSC Audio Products, Inc. [. . . ]