4181
Single 460 mm (18")
Cinema Subwoofer System


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Single 460 mm (18") Cinema Subwoofer System
The JBL Model 4181 is a high quality subwoofer system, featuring a 460 mm (18 in), low frequency transducer mounted in a direct radiator, bass-reflex enclosure for smooth response to the lowest audible frequencies. The 4181 is ideal for low-frequency augmentation of digital soundtracks in motion picture theaters and for general sound reinforcement applications.

FEATURES
  • 500 Watts continuous pink noise, 1000 Watts continuous program power handling
  • Usable response to 28 Hz (-10 dB, no EQ), flat to 34Hz (-3 dB) with External EQ
  • Dual coils in parallel, vented cooling driver
    - High Sensitivity
    - Low Power Compression
    - High Maximum - SPL Capability
    - Low 2nd and 3rd Harmonic Distortion
    - Long Excursion Capability

SPECIFICATIONS
Rated Impedance 8 ohms
Minimum Impedance 5.6 ohms
Continuous Pink Noise 500 Watts
Continuous Program 1000 Watts
Peak Power 2000 Watts
Axial Sensitivity 50 Hz to 500 Hz; 101 dB, 1W @ 1m
40 Hz to 100 Hz; 99 dB, 1W @ 1m
Half-Space Reference Efficiency Single Module: 5%
Two Modules: 10%
Three Modules: 15%
Four Modules: 20%
Max. Continuous Acoustical Power Output Single Module: 25W
Two Modules: 100W
Three Modules: 225W
Four Modules: 400W
Maximum Continuous SPL @ 1 meter Single Module: 126 dB
Two Modules: 132 dB
Three Modules: 136 dB
Four Modules: 138 dB
Maximum Peak SPL @ 1 meter Single Module: 132 dB
Two Modules: 138 dB
Three Modules: 142 dB
Four Modules: 144 dB
Frequency Response Lower Frequency Limits (no EQ):
-10 dB: 28 Hz
-3 dB: 40 Hz
Lower Frequency Limits (with EQ):
-10 dB: 26 Hz
-3 dB: 34 Hz
Recommended Crossover Frequencies: High-pass: 20 Hz, 24 dB/octave or greater
Low-pass: 80 Hz to 150 Hz, 12 dB/octave or greater
Distortion
2nd harmonic
3rd harmonic

<3%
<2@
System Polarity EIA Standard. Positive voltage to RED terminal produces forward cone motion.
Input Connectors Color-coded binding posts
Nominal Diameter 460 mm (18 in)
Materials and Finish 15mm MDF. Extensive bracing on all panels. Vinyl laminated.
Enclosure Tuning Frequency 30 Hz
Net Internal Volume 255 liters (9 cu. ft)
Dimension (H x W x D) 1100 mm x 640 mm x 450 mm
(43 1/3 in x 25 1/5 in x 17 3/4 in)
Net Weight 44 kg (96 lbs.)
Shipping Weight 50 kg (109 lbs.)

SPEC SHEETS (PDF)