TD-000141-00 - QSC Service
Contents
1. 1675 MacArthur Blvd Costa Mesa CA 92626 USA Cc Main Number 714 754 6175 Sales amp Marketing 714 957 7100 or toll free USA only 800 854 4079 Customer Service 714 957 7150 or toll free USA only 800 772 2834 Cinema Loudspeaker Systems User Manual LF 421 5 Low Frequency Loudspeaker Introduction The LF 4215 dual 15 381mm low frequency enclosure is designed specifically for cinema applications Meeting cinema requirements for extended low frequency response differenti ates the LF 4215 from more conventional rock and roll woofer systems The LF 4215 cov ers the frequency range from 35 Hertz to 1000 Hertz depending upon the high frequency system requirements Close Coupled Woofers CCW with its tight spacing between woof ers 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 An undercut pole piece ensures the voice coil operates in a Symmetrical Magnetic Gap SMG reducing second harmonic distortion The enclosure is constructed of high quality MDF panels and features Single Woofer Cham bers SWC separate chambers for2. Frequency 120 60 115 55 110 50 105 2pi 45 100 I 5 ZUR i A m s Tn 3 5 S Dik L 4pi 9 Z 3 2 5 N x cs 85 53 1 2 80 1 20 1 75 7 15 7 Impedance i 65 T 5 I d 60 0 10 Hz 20 50 100 200 500 1K 2K 5K 10K Frequency Hertz Warranty USA only other countries see your dealer or distributor Disclaimer OSC Audio Products Inc is not liable for any damage to amplifiers or any other equipment that is caused by negligence or improper installation and or use of this loudspeaker product QSC Audio Products 3 Year Limited Warranty OSC Audio Products Inc QSC guarantees its products to be free from defective material and or workmanship for a period of three 3 years from date of sale and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use provided the unit is returned to our factory or one of our authorized service stations via pre paid transportation with a copy of proof of purchase i e sales receipt This warranty provides that the examination of the return product must indicate in our judgment a manufacturing defect This warranty does not extend to any product which has been subjected to misuse neglect accident improper installation or where the date code has been removed or defaced OSC shall not be liable for incidental and or conseq
3. damaged in any way WARNING Before placing installing rigging or suspending any speaker product inspect all hardware suspension cabinets transducers brackets and associated equipment for damage 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 Never exceed the rating of the hardware or equipment Consult a licensed professional engineer when any doubt or questions arise regarding a physical equipment installa tion 9 Mounting points for high or mid high system 4 102m m 20 508mm Copyright 2003 2004 OSC Audio Products Inc QSC is a registered trademark of OSC Audio Products Inc QSC and the QSC logo are registered with the U S Patent and Trademark Office TD 000141 00 rev C Connections Ja TTT Seg DUDUDUDUDUDUDUDU DUDUDU DTT Amplifier capable of driving 4 ohm loads Normal Connection Normal Connection Example The LF 4215 has barrier strip screw termi nals for connection The terminals accept up to 10 AWG stranded loudspeaker
4. wir ing Use the largest wire size and shortest wire length possible for a given installa tion Observe the polarity markings and keep polarity consistent throughout the system for best performance S e o INPUT SPKI SPK2 Parallel Connection of Second SB 5218 Parallel Connection Example A The terminals marker SPK2 may be used to in DN connect another LF 4215 in parallel Con nect the wires as shown in the illustration at right Note If the LF 4215 s internal wir ing 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 Amplifier capable of driving 2 ohm loads INPUT SPK sii SPK2 SPEAKERS INTERNALLY CONNECTED IN PARALLEL FOR SPEAKERS INTERNALLY CONNECTED IN PARALLEL FOR INDIVIDUAL CONNECTION REMOVE PANEL CUT YELLOW INDIVIDUAL CONNECTION REMOVE PANEL CUT YELLOW AND BLUE JUMPER WIRES AND BLUE JUMPER WIRES For instructions see User Manual For instructions see User Manual Individual Transducer Connection Individual Transducer requires mod
5. 0 Hertz AES method recommended amplifier power capability 1600 watts rms maximum into 4 ohms per LF 4218 Sensitivity 99 5 dB half space 93 5 dB full space 35 1000 Hertz 1 watt 1 meter Recommended Processing Subsonic filter below 30 Hertz gt 18 dB per octave maximum recommended crossover frequency is 1000 Hertz OSC DSP configurations are available at www qscaudio com Parameters for alternative processing hardware are available upon request Connectors 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 For independent transducer connection remove blue jumper wire and yel low jumper wire on internal side of terminal cup and mark enclosure accordingly Transducers Two 15 381mm high efficiency low frequency transducers featuring vented 4 100mm copper voice coils on Kap ton formers High excursion low distortion design with extremely high power handling and low thermal and port compression Enclosure Quasi B4 alignment ported enclosure with fully flared ports low turbulence symmetrical port design tuned to 36 Hertz constructed of medium density fibreboard and heavily braced Features vandal resistant woofer mounting bolts Size 30 wide X 35 high X 20 deep 762 mm X 889 mm X 508 mm Weight 195 Ibs shipping 172 Ibs net 88 78 kg SPL and Impedance vs
6. each transducer 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 With Symmetrical Port Loading SPL bass ports are evenly spaced on each side of the trans ducers making internal pressure more uniform across the back surface of the transducer This prevents the cone from being displaced to one side or another by unbalanced forces reducing the chance of driving the voice coil out of the center of the gap at high power Three T nuts in the top of the enclosure provide easy mounting of QSC s HF 75 high fre quency system or MH 1075 mid high system Enclosure is not designed to be suspended flown or rigged Do not sus A pend fly or rig this enclosure This product is capable of producing sound pressure levels that can perma nently damage human hearing Always keep sound pressure levels in the listening area below levels that can damage human hearing Install in accordance with OSC Audio Product s instructions and a licensed professional engineer Only use attachments mounts accesso ries or brackets specified by OSC Audio Products Inc Refer all servicing to qualified personnel Servicing is required when the apparatus has been
7. ification Connection Example The transducers are wired in parallel inside the enclosure If individual trans ducer connection is required remove the CAUTION terminal cup and remove the yellow and A squires removal Amplifier capable of the blue jumper wires that are connected qure driving 2 ohm loads between the SPK1 and SPK2 terminals of terminal cup Replace the terminal cup and mark the and cutting of both the enclosure with a note of the modification yellow and the blue jumper wires that con nect the SPK1 and SPK2 terminals o H e mE INPUT SPKI SPK2 LF 4215 Specifications subject to change without notice Frequency Range 38 1300 Hertz 3 dB 30 1400 Hertz useable range 10 dB Nominal Coverage 100 horizontal X 55 vertical at 600 Hertz Maximum Output 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 Impedance 4 ohms nominal 3 4 ohms minimum 150 Hertz 25 ohms maximum 22 Hertz Maximum Input Power 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 50
8. mours and Company
9. uential damages This warranty gives you specific legal rights 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 lim ited 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 Periodically this warranty is updated To obtain the most recent version of OSC s war ranty 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 OSC Audio Products Inc 1675 MacArthur Boulevard Costa Mesa CA 92626 1468 USA Telephone Numbers Main Number 714 754 6175 Sales amp Marketing 714 957 7100 or toll free USA only 800 854 4079 Customer Service 714 957 7150 or toll free USA only 800 772 2834 Facsimile Numbers Sales amp Marketing Fax 714 754 6174 Customer Service Fax 714 754 6173 World Wide Web www gscaudio com E mail info qscaudio com service qscaudio com Qsc OSC Audio Products Inc 1675 MacArthur Boulevard Costa Mesa California 92626 USA 2003 2004 QSC and the QSC logo are registered with the U S Patent and Trademark Office Kapton is a registered trademark of E l du Pont de Ne
Download Pdf Manuals
Related Search