JL Audio 12W4-4 User manual

12W4-D4
23.1 Hz
0.391
0.417
6.490
4.77 135.1
0.400 10.2
87.8 dB
82.5 0.0532
6.44 Ω(in series)
Dual 4 Ω
200 Watts
12W4-4
23.2 Hz
0.396
0.416
7.898
5.14 145.6
0.400 10.2
88.2 dB
82.5 0.0532
3.13 Ω
4 Ω
200 Watts
Subwoofer Specifications
Fs (free-air resonance):
Qts (total speaker “Q”):
Qes (electrical “Q”):
Qms (mechanical “Q”):
Vas (equivalent compliance):
Xmax (linear excursion one-way):
Efficiency (1W/1m)*:
Sd (effective piston surface area):
Re (DC resistance):
Znom (nominal impedance):
Pt (continuous thermal power handling):
Physical Dimensions
Frame Diameter (A):
Mounting Hole Diameter (B):
Mounting Depth (C):
Overall Depth (D):
Magnet Diameter (E):
Displacement:
Normal Recommended Enclosures (single driver)
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 final 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).
*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”!
Ported Enclosure
H
D
W
H
D
W
ft3liters
in. mm
in2m2
in. mm
in. mm
in. mm
in. mm
in. mm
ft3liters
ft3
in.
liters
mm
in2m2
AB
C
D
E
12.25
11.125
5.75
6.375
5.6875
0.07
311.15
282.57
146.05
161.95
144.46
1.979
Port
(inside dia. X length)
Model
Sealed
Enclosure
Ported
Enclosure
20”x 13”x 12.25”
508mm x 330mm x 311mm
12W4-4
20”x 14”x 19.75”
508mm x 356mm x 502mm
4”X 13.5”
1.25 ft3
102mm X 343mm
2.25 ft3
width X height X depthVolume (Net Int.)
35.4 l
63.7 l
20”x 13”x 12.25”
508mm x 330mm x 311mm
12W4-D4
20”x 14”x 17.75”
508mm x 356mm x 451mm
4”X 15.2”
1.25 ft3
102mm X 386mm
2.00 ft3
width X height X depthVolume (Net Int.)
35.4 l
56.6 l
Be sure to allow 0.75 inches (19mm) for pole vent clearance on this driver.

•Do NOT use different impedance speakers when using multiple subwoofers!
•JL Audio recommends using subwoofers as part of a bi-amplified 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
flexible, allowing it to fit 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.
With coils wired in parallel, a dual 4Ωspeaker will present a 2Ωload. With coils wired in series, a dual 4Ωspeaker will present a 8Ωload.
With coils AND speakers wired in parallel:
2 dual 4Ωspeakers (D4) will present a 1Ωload.
With the coils wired in series and the speakers wired in parallel:
2 dual 4Ωspeakers (D4) will present a 4Ωload.
Wired directly to the amplifier:
A single 4Ωspeaker will present a 4Ωload.
With speakers wired in parallel:
Two 4Ωspeakers will present a 2Ωload.