8IB4 10IB4 12IB4
Subwoofers
owner’s manual
Congratulations on your purchase of a JL Audio subwoofer component. Your JL Audio subwoofer is a
precision loudspeaker which has been engineered to produce the highest quality sub-bass performance in
your vehicle. Authorized JL Audio dealers have extensive technical information about your new speaker.
CAUTION
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CAUTION
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AMPLIFIER
AMPLIFIER
AMPLIFIER
IB4
8.0
4.0
2.7
SUBWOOFER SPECIFICATIONS
CAUTION
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CAUTION
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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
*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”.
WIRING OPTIONS
This woofer is specifically designed for infinite baffle installation. It may be used in a lar ge sealed enclosure of at least 8 cubic feet if necessary. This woofer is not well suited for ported or bandpass applications.
IMPORTANT
CAUTION
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 preser ve your ability to enjoy its fidelity.
2 JL AUDIO IB4
8IB4
12IB4
10IB4
MINIMUM
OPTIMUM MAXIMUM
LEGEND:
WARRANTY VOID
25W 50W 100W 200W 400W
RECOMMENDED CONTINUOUS (RMS) POWER RANGE FOR ONE SUBWOOFER DRIVER:
MEDIUM GRAY (MINIMUM):
From a reliability standpoint, this zone
represents a very comfortable operating
power range for each driver. This level of
power will not stress the woofer but will not
extract all of its performance potential, either.
Use of less than the minimum power level
will not damage the woofer, but may result
in unsatisfactory performance.
JL Audio offers an extensive line of high-performance subwoofer drivers to fit a wide variety of enclosure and power applications. When designing systems with our
drivers, it is very important to achieve a good power match between the subwoofer amplifier and the subwoofer driver's capabilities. The power levels listed in the
above chart represent continuous (RMS) amplifier power per woofer and assume that the user will regularly make full use of that power without drastically
overdriving the amplifier(s). Make sure you factor system impedance and the total number of subwoofers into your calculations. Adhering to these power
recommendations will result in systems that are both reliable and enjoyable.
LIGHT GRAY (OPTIMUM):
This zone represent s the best compromise
between long-term reliabilit y, high-output
and low-distortion performance and is
center ed on each woofe r's contin uous
power ratin g (as published in its
specifications). In this zone, you will be
taki ng f ull advan tage of the woofe r's
optimum, low-distortion performance
range without undue risk of failure.
DARK GRAY (MAXIMUM):
In this zone , low-distortion output and
long-term reliability will be compromised
(especially by an aggressive user). Slightly
more SPL will be gained by pushing the
power into this zone , but typically not more
than 2dB, compared to the light gray zone.
The closer you are to the black zone, the
higher the likelihood of driver failure.
Operate with caution.
BLACK (WARRANTY VOID):
We d o not recom mend operating
woofers at this level of power. In this zone,
there is a very high probability that the
driver will fail due to excessive heat and/or
mechanical stress.
Subwoofer drivers operated at these
levels of power are NOT covered under
warranty.
JL AUDIO IB4 3
JL Audio customer service: (954) 443-1100 during normal business hours (Eastern Time)
For Service Information in the U.S.A. please call:
JL Audio, Inc
10369 North Commerce Parkway, Miramar, FL 33025
Products purchased outside the United States of America are covered only by that countr y’s distributor and not by JL Audio, Inc.
International Warranties:
Printed in USA JLIB4-11-2003
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