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 - 500 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, >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). 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 lbs. shipping, 172 lbs. net (88/78 kg.)
SPL and Impedance vs. Frequency
Frequency (Hertz)
SP
L (dB)
Im
pe
danc
e (o
hms)
SPL 2pi
Impedance
SPL 4pi
