JL Audio 15W4-D4, 15W4-D2 Owners Manual
Subwoofer Specifi cations
Fs (free-air resonance):
Qts (total speaker “Q”):
Qes (electrical “Q”):
Qms (mechanical “Q”):
Vas (equivalent compliance):
Xmax (linear excursion one-way):
Effi ciency (1W/1m)*:
Sd (effective piston surface area):
Re (DC resistance):
Znom (nominal impedance):
Pt (continuous thermal power handling):
15W4-D2
19.2 Hz
0.370
0.387
8.738
12.03 340.7
0.400 10.2
ft
in.
3
89.7 dB
131.0 0.0845
in
2
3.32 Ω
Dual 2 Ω
200 Watts
liters
mm
m
2
15W4-D4
19.5 Hz
0.367
0.382
9.370
12.59 356.5
0.400 10.2
ft
in.
3
90.2 dB
131 0.0845
in
2
6.41 Ω (in series)
Dual 4 Ω
200 Watts
liters
mm
m
2
*Effi ciency (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”!
Physical Dimensions
Frame Diameter (A):
Mounting Hole Diameter (B):
Mounting Depth (C):
Overall Depth (D):
Magnet Diameter (E):
Displacement:
15.1875
13.75
7
7.625
5.6875
0.11
in.
in.
in.
in.
in.
ft
385.76
349.25
177.8
193.67
144.46
3
3.110
mm
mm
mm
mm
mm
liters
Be sure to allow 0.75 inches (19mm) for pole vent clearance on this driver.
A
D
B
E
C
Normal Recommended Enclosures (single driver)
3
3
15W4-D2
width X height X depthVolume (Net Int.)
22” x 16” x 15.25”
559mm x 406mm x 387mm
24” x 19” x 18”
610mm x 483mm x 457mm
TWO 3” X 11.2”
TWO 76mm X 284mm
H
D
15W4-D4
3
2.25 ft
63.7 l
3
3.75 ft
106.2 l
Ported Enclosure
559mm x 406mm x 387mm
610mm x 483mm x 483mm
W
width X height X depthVolume (Net Int.)
22” x 16” x 15.25”
24” x 19” x 19”
TWO 3” X 10.1”
TWO 76mm X 257mm
H
D
Model
Sealed
Enclosure
Ported
Enclosure
2.25 ft
63.7 l
3.50 ft
99.1 l
Port
(inside dia. X length)
W
Sealed Enclosure
•Enclosure dimensions listed are external dimensions which assume the use of 0.75 inch (19mm) thick material. If you are using
0.625 inch (16mm) thick material, subtract 0.25 inches (6.5mm) from each dimension. Do not use material with a thickness of
less than 0.625 inches (16mm).
•Enclosure volumes listed are NET internal volumes. Driver displacement, port displacement and brace displacement must be
added to obtain the fi nal gross volume. The dimensions listed have already taken this into account.
•When using two subwoofers in a common enclosure simply double the required volumes and use two of the recommended ports
(when needed). Likewise, when using three subwoofers in a common enclosure simply triple the required volume and number
of ports (when needed).
With coils wired in parallel, a dual 4Ω speaker will present a 2Ω load.
With coils wired in parallel, a dual 2Ω speaker will present a 1Ω load.
With coils wired in series, a dual 4Ω speaker will present a 8Ω load.
With coils wired in series, a dual 2Ω speaker will present a 2Ω load.
With coils AND speakers wired in parallel:
2 dual 4Ω speakers (D4) will present a 1Ω load.
With coils AND speakers wired in parallel:
2 dual 2Ω speakers (D2) will present a 0.5Ω load.
With the coils wired in series and the speakers wired in parallel:
2 dual 4Ω speakers (D4) will present a 4Ω load.
With the coils wired in series and the speakers wired in parallel:
2 dual 2Ω speakers (D2) will present a 2Ω load.
•Do NOT use different impedance speakers when using multiple subwoofers!
•JL Audio recommends using subwoofers as part of a bi-amplifi ed system using high quality satellite speakers like our Evolution line
of coaxial and component speakers. We do not recommend the use of passive crossover components (coils) on subwoofers. These
components may adversely affect the performance of a subwoofer.
•When dealing with exceedingly long port lengths, we recommend the use of JL Audio’s Flex-Port System. The Flex-Port tubing is
fl exible, allowing it to fi t in otherwise tight locations. The Port mouths provide not only a convenient method of securing the port,
but a smooth, rounded edge for the port termination as well.
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