JL Audio 12W4-4 Manual de usuario

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

ft3liters

in. mm

in2m2

in. mm

ft3liters

ft3

in.

liters

in2m2

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.

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