Jl Audio 15W3 18W3 Users Manual 15/18 W3 MAN

15W3 18W3 15_18_W3_MAN

15W3 18W3 to the manual 492a8f46-8220-8894-9542-40db841737d5

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15W3

18W3

Subwoofers

o w n e r ’s m a n u a l

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 for many different
applications of your new speaker. They also have the knowledge, skills and tools to build a high-quality
enclosure that will maximize the performance of your speaker. We highly recommend that you have
your enclosure built by an authorized JL Audio dealer.

Inside you will find specifications and two recommended enclosures for your speaker; one is a sealed
enclosure, the other is a ported design. Both types of enclosures will give you excellent sound quality and
low-frequency extension. The sealed enclosure is a better choice if space is extremely tight, but the ported
enclosure will produce 3dB more output at the same power if you have the extra space to work with.

If you decide to build one of these enclosures yourself, you must have the construction of the box
inspected and approved by your authorized JL Audio dealer in order for the 1 year limited warranty to
be valid. Please read the warranty information carefully.

SUBWOOFER SPECIFICATIONS
SUBWOOFER:

15W3-D2

15W3-D4

18W3-D2

18W3-D4

Free Air Resonance (Fs):
Electrical “Q” (Qes):
Mechanical “Q” (Qms):
Total Speaker “Q” (Qts):
Equiv. Compliance (Vas):

21.3 Hz
0.4559
8.854
0.434
8.42 ft3
238.5 litres
0.675 in
17.1 mm
88.8 dB
127.5 in2
0.0823 m2
3.34Ω
Dual 2Ω
400W
8.125 in
206 mm
13.875 in
352 mm
0.140 ft3
3.9 litres

21.8 Hz
0.4302
8.854
0.41
8.42 ft3
238.5 litres
0.675 in
17.1 mm
89.4 dB
127.5 in2
0.0823 m2
6.66Ω
Dual 4Ω
400W
8.125 in
206 mm
13.875 in
352 mm
0.140 ft3
3.9 litres

19.0 Hz
0.4079
8.7578
0.39
13.339 ft3
377.1 litres
0.500 in
12.7 mm
89.8 dB
186.1 in2
0.12009 m2
3.36Ω
Dual 2Ω
500W
9.0625 in
230 mm
16.5 in
419 mm
0.20 ft3
5.6 litres

19.7 Hz
0.456
8.0183
0.432
13.339 ft3
377.1 litres
0.500 in
12.7 mm
89.8 dB
186.1 in2
0.12009 m2
6.54Ω
Dual 4Ω
500W
9.0625 in
230 mm
16.5 in
419 mm
0.20 ft3
5.6 litres

One-way, Linear Excursion:
(Xmax)*
Efficiency (1W/1m)**:
Effective Piston Area (Sd):
DC Resistance (Re)***:
Nominal Impedance:
Power Handling (continuous):
Mounting Depth:
Mounting Hole Diameter:
Driver Displacement:

*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”. ***Re (DC resistance) is measured with
the voice coils in series, for parallel-wired specification divide Re by 4. All other specifications remain the same.

WIRING OPTIONS
W 3 VO I C E C O I L S I N S E R I E S :

AMPLIFIER

W3-D4: 8.0Ω
W3-D2: 4.0Ω

AMPLIFIER

AMPLIFIER

W3-D4: 4.0Ω
W3-D2: 2.0Ω

AMPLIFIER

2

W 3 VO I C E C O I L S I N PA R A L L E L :

W3-D4: 2.0Ω
W3-D2: 1.0Ω

AMPLIFIER

W3-D4: 2.7Ω
W3-D2: 1.3Ω

W3-D4: 1.0Ω
W3-D2: 0.5Ω

AMPLIFIER

W3-D4: 0.7Ω
W3-D2: 0.3Ω

JL AUDIO 15W3/18W3

RECOMMENDED ENCLOSURES
SUBWOOFER

15W3-D2
15W3-D4
18W3-D2
18W3-D4

SEALED ENCLOSURE
Volume
(net int.)
2.125 ft3
60.2 litres
2.125 ft3
60.2 litres
3.00 ft3
85 litres
3.25 ft3
92 litres

External Dimensions
(Width x Height x Depth)
22" x 16" x 14.75"
559mm x 406mm x 375mm
22" x 16" x 14.75"
559mm x 406mm x 375mm
24" x 19" x 15.5"
610mm x 483mm x 394mm
24" x 19" x 16.75"
610mm x 483mm x 425mm

PORTED ENCLOSURE
Volume
(net int.)
3.50 ft3
99.1 litres
3.50 ft3
99.1 litres
4.00 ft3
113.3 litres
4.50 ft3
127.4 litres

External Dimensions
(Width x Height x Depth)
24" x 19" x 18"
610mm x 483mm x 457mm
24" x 19" x 18"
610mm x 483mm x 457mm
26" x 22" x 16.25"
660mm x 559mm x 413mm
26" x 22" x 18"
660mm x 559mm x 457mm

Port(s)
(Inside Dia. x Length)
(2) 3.0" x 11.6"
(2) 76mm x 295mm
(2) 3.0" x 10.9"
(2) 76mm x 277mm
(2) 3.0" x 10.1"
(2) 76mm x 257mm
(2) 3.0" x 8.6"
(2) 76mm x 218mm

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 preserve your ability to enjoy
its fidelity.
When installing a subwoofer
in your vehicle, it is extremely
important to secure the enclosure
firmly. We recommend bolting the
enclosure through the metal of
the floorpan or the frame of the
vehicle with large diameter washers
for reinforcement. If an enclosure
is not firmly attached, it can
become a projectile in a collision.
This is particularly important in a
hatchback, station wagon, sports
utility vehicle, or van.

• The enclosure recommendations listed above are
external dimensions which assume the use of 3/4"
(19mm) thick material. If you are using 5/8"
(16mm) thick material, subtract 1/4" (6.5mm) from
each dimension. Do not use any material with a
thickness of less than 5/8" (16mm) as this may
compromise the rigidity of the enclosure.
• All enclosure volumes listed above are net
internal volumes! Driver displacement, port

displacement and brace displacement must be
added to obtain the final gross internal volume.
All enclosure dimensions above have already taken
this into acount.
• When using two subwoofers in a common
enclosure simply double the required volume and,
in the case of a ported enclosure, use two times
the recommended port(s). Likewise, when using
three subwoofers in a common enclosure simply

triple the required volume and, in the case of a
ported enclosure, use three times the
recommended port(s).
• We recommend the use of this speaker in a
bi-amplified system using high-quality satellite
speakers and a high-quality amplifier. We do not
recommend the use of this subwoofer with a
passive crossover (coil), as this type of device will
adversely affect performance.

All specifications are subject to change without notice.

JL AUDIO 15W3/18W3

3

RECOMMENDED CONTINUOUS (RMS) POWER RANGE FOR ONE SUBWOOFER DRIVER:
30W

60W

125W

250W

500W

D A R K G R AY :
MAXIMUM

BLACK:
WA R R A N T Y V O I D

1000W

18 W 3
15 W 3

LEGEND:
M E D . G R AY :
MINIMUM

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.

L I G H T G R AY :
OPTIMUM

LIGHT GRAY (OPTIMUM):
This zone represents the best compromise
between long-term reliability, high-output and lowdistortion performance and is centered on each
woofer's continuous power rating (as published in
its specifications). In this zone, you will be taking full
advantage of the woofer'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 do not recommend 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 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.

JL AUDIO LIMITED WARRANTY (USA)
Automotive Subwoofer Components
JL AUDIO warrants this speaker to be free of defects in materials and workmanship for a period of one (1) year from the original date of purchase, contingent upon installation
being performed or approved by an authorized JL AUDIO dealer, in writing, on the original sales receipt. If the preceding condition is not met, the warranty term is
limited to ninety (90) days from the original purchase date.
This warranty is not transferrable and applies only to the original purchaser of the product from an authorized JL AUDIO dealer. Should service be necessary under this warranty
for any reason due to manufacturing defect or malfunction, JL AUDIO will, at its discretion, repair or replace the defective product with new or remanufactured product at no charge.
Damage caused by the following is not covered under warranty: accident, misuse, abuse, product modification or neglect, failure to follow installation instructions, unauthorized
repair attempts, misrepresentations by the seller. This warranty does not cover incidental or consequential damages and does not cover the cost of removing or reinstalling the
unit(s). Cosmetic damage due to accident or normal wear and tear is not covered under warranty.
Any applicable implied warranties are limited in duration to the period of the express warranty as provided herein beginning with the date of the original purchase at retail, and
no warranties, whether express or implied, shall apply to this product thereafter. Some states do not allow limitations on implied warranties, therefore these exclusions may not
apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
If you need service on your JL AUDIO product:
All warranty returns should be sent to JL AUDIO freight prepaid through an authorized JL AUDIO dealer and must be accompanied by proof of purchase (a copy of the original
sales receipt.) Direct returns from consumers or non-authorized dealers will be refused unless specifically authorized by JL AUDIO with a valid return authorization number.
Warranty expiration on products returned without proof of purchase will be determined from the manufacturing date code. Coverage may be invalidated as this date is previous
to purchase date. Return only defective components. Non-defective items received will be returned freight-collect. Customer is responsible for shipping charges and insurance in
sending the product to JL AUDIO. Freight damage on returns is not covered under warranty. Always include proof of purchase (sales receipt).
For Service Information in the U.S.A. please call:
JL Audio customer service: (954) 443-1100 during normal business hours (Eastern Time)
JL Audio, Inc
10369 North Commerce Parkway, Miramar, FL 33025
International Warranties:
Products purchased outside the United States of America are covered only by that country’s distributor and not by JL Audio, Inc.

Printed in USA

JL15-18W3-02-2003



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