CAUTION
SUBWOOFER: 8IB4 10IB4 12IB4
Free Air Resonance (Fs): 37.5 Hz 37.5 Hz 40.5 Hz
Electrical “Q” (Qes): 0.744 0.837 0.673
Mechanical “Q” (Qms): 8.484 9.400 10.967
Total Speaker “Q” (Qts): 0.684 0.769 0.634
Equiv. Compliance (Vas): 1.80 ft³
2.93 ft³
3.97 ft³
51.0 litres 83.0 litres 112.4 litres
One-way, Linear Excursion: 0.34 in 0.30 in 0.29 in
(Xmax)* 8.6 mm 7.6 mm 7.3 mm
Efficiency (1W/1m)**: 87.4 dB 89.0 dB 92.2 dB
Effective Piston Area (Sd): 30.7 in²
51.8 in²
78.5 in²
0.0198 m²
0.0334 m²
0.0506 m²
DC Resistance (Re): 6.10Ω 7.20Ω 6.07Ω
Nominal Impedance: 8Ω 8Ω 8Ω
Power Handling (continuous): 75W 100W 125W
Mounting Depth: 3.875 in 5.2 in 5.5 in
98 mm 132 mm 140 mm
Mounting Hole Diameter: 7.0 in 9.125 in 11.0625 in
178 mm 232 mm 281 mm
Driver Displacement: 0.03 ft³
0.05 ft³
0.06 ft³
0.792 litres 1.414 litres 1.696 litres
Prolonged exposure to sound pressure levels in excess of 100dB can cause permanent hearing loss. This high-performance speaker can exceed this level. Please exercise restraint in its operation
in order to preserve your ability to enjoy its fidelity.
WIRING OPTIONS
2 JL AUDIO IB4
*Xmax specifications are derived via one-way voice coil overhang
method with no correction factors applied. **Efficiency (1W/1m)
is not an accurate indicator of a subwoofer’s output capability
and should not be used as a comparison to other subwoofers to
determine which one is “louder”.
SUBWOOFER SPECIFICATIONS
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