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LF-4115 Specifications (subject to change without notice)
Frequency Range: 33 - 1200 Hertz (-6dB)
29 - 3000 Hertz useable range (-10dB)
Nominal Coverage: 100° horizontal X 100° vertical at 1000 Hertz
Maximum Output:
127.0dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 35 - 1000 Hertz.
121.0dBA 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
4.3 ohms minimum, 160 Hertz
40 ohms maximum, 22 Hertz
Maximum Input Power: 400 watts rms (8 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
600 watts rms (2 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
recommended amplifier power capability- 1100 watts rms maximum into 4 ohms (per LF-4115)
Sensitivity: 93.5dB half space, 92.0dB full space, 35 - 1000 Hertz, 1 watt, 1 meter
Recommended Processing: 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.
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: 15” (381mm) high efficiency low frequency transducer featuring vented 4” (100mm) copper voice coil on Kapton®
formers. High excursion/low distortion design, with extremely high power handling, and low thermal and port com-
pression.
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 18” high X 20” deep (762mm X 457mm X 508mm)
Weight: 96 lbs. shipping, 83 lbs. net (44/38 kg.)
SPL and Impedance vs. Frequency
Frequency (Hertz)
SPL (dB)
Impedance (ohms)
SPL 2pi
Impedance
SPL 4pi