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LF-3215 Specifications (subject to change without notice)
Frequency Range: 32 - 1500 Hertz (-6dB)
28 - 3300 Hertz useable range (-10dB)
Nominal Coverage: 100° horizontal X 55° vertical at 600 Hertz
Maximum Output:
132.5 dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 25 - 250 Hertz.
126.5 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
4.1 ohms minimum, 180 Hertz
55 ohms maximum, 21 Hertz
Maximum Input Power: 600 watts rms (8 hours of 6 dB crest factor pink noise, 40 - 400 Hertz)
750 watts rms (2 hours of 6 dB crest factor pink noise, 40 - 400 Hertz)
Recommended amplifier power capability- 1200 watts rms maximum into 4 ohms (per LF-3215)
Sensitivity: 98.5 dB half space, 97.5 dB 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 stranded wire. Four terminals: (two INPUT and two PARALLEL
OUT). Transducers are internally wired in parallel. For independent transducer connection, remove blue jumper wire
and yellow jumper wire on internal-side of terminal cup and mark enclosure accordingly.
Transducers: Two 15” (381mm) high efficiency low frequency transducers featuring vented 3” (76mm) copper voice coils 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 35” high X 20” deep (762 mm X 889 mm X 508 mm)
Weight: 195 lbs. shipping, 172 lbs. net (88/78 kg.)
SPL and Impedance vs. Frequency
Frequency (Hertz)
SPL (dB)
Impedance (ohms)
SPL 2pi
Impedance
SPL 4pi