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LF-4315 Specifications (subject to change without notice)
Frequency Range: 32 - 1200 Hertz (-6dB)
28 - 2800 Hertz useable range (-10dB)
Nominal Coverage: 125° horizontal X 60° vertical at 315 Hertz
Maximum Output:
136.0dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 35 - 1000 Hertz.
130.0dBA SPL calculated maximum continuous, 1 meter. The dBA scale is typically used to identify sound sources
which can cause permanent hearing loss.
Impedance: 5.5 ohms nominal
4.5 ohms minimum, 150 Hertz
30 ohms maximum, 22 Hertz
Maximum Input Power: 1200 watts rms (8 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
1500 watts rms (2 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
recommended amplifier power capability- 2400 watts rms maximum into 4 ohms (per LF-4315)
Sensitivity: 99.0dB half space, 98.0dB full space, 35 - 1000 Hertz, 1 watt, 1 meter
Recommended Processing: Subsonic filter below 25 Hertz, >18 dB per octave, maximum recommended crossover frequency is 500 Hertz. QSC 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 (5.3mm
2
) stranded wire. Four terminals: (two INPUT and two par-
allel OUTPUT).
Transducers: Three 15” (381mm) high efficiency low frequency transducer featuring vented 4” (100mm) copper voice coil on Kap-
ton® formers. High excursion/low distortion design, with extremely high power handling, and low thermal compres-
sion.
Enclosure: Quasi B4 alignment, ported enclosure with fully flared ports, low turbulence symmetrical port design, tuned to 34
Hertz, constructed of medium density fiberboard and heavily braced. Features vandal resistant woofer mounting bolts.
Size: 30” wide X 53” high X 20” deep (762mm X 1321mm X 508mm)
Weight: 290 lbs. shipping, 260 lbs. net (132/118 kg.)
SPL and Impedance vs. Frequency
Frequency (Hertz)
SPL (dB)
Impedance (ohms)
SPL 2pi
Impedance
SPL 4pi