JBL 4181 è un sistema subwoofer di alta qualità, caratterizzato da un trasduttore a bassa frequenza avanzato da 460 mm (18"), montato in un radiatore diretto con enclosure bass-reflex per una risposta uniforme alle frequenze udibili più basse. Il 4181 è ideale per l'aumento delle basse frequenze di colonne sonore analogiche o digitali nei cinema e per applicazioni generali di rinforzo sonoro.
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| Rated Impedance | 8 ohms |
| Minimum Impedance | 5.6 ohms |
| Power Handling Capability | Continuos Pink Noise: 500 W Continuous Program: 1000 W Peak Power: 2000 W |
| 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: 25 W; Two Modules: 100 W; Three Modules: 225 W; Four Modules: 400 W |
| 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: < 3% 3rd harmonic: < 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) |
| Dimensions (H x W x D) | 1100 mm x 640 mm x 450 mm (43.3 in x 25.2 in x 17.75 in) |
| Net Weight | 44 kg (96 lbs.) |
| Shipping Weight (ea) | 50 kg (109 lbs.) |
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