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JL Audio Subwoofe Leaflet

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8W1-8
35.7 Hz
0.385 
0.414
6.247
0.78 22.1
0.282 7.2
85.6 dB
30.7 0.0198
6.89 
Ω
8 
Ω
100 Watts
8W1-4
33.2 Hz
0.345 
0.355
11.5
 0.90 
25.5
 0.282 
7.2
86.0 dB
 30.7 
0.0198
3.34 
Ω
4 
Ω
100Watts
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):
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 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).
*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”!
Ported Enclosure
H
D
W
H
D
W
ft
3
liters
in.
mm
in
2
m
2
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
ft
3
liters
ft
3
in.
liters
mm
in
2
m
2
A
B
C
D
E
8.25
7
3.75
4.25
4.5625
0.025
209.55
177.8
95.25
107.95
115.88
0.707
Port
(inside dia. X length)
Model
Sealed
Enclosure
Ported
Enclosure
16” x 9” x 6.75”
406mm x 229mm x 171mm
8W1-4
15” x 9” x 15.5”
381mm x 229mm x 394mm
2.5” X 12.4”
0.30 ft
3
64mm X 318mm
0.75 ft
3
width X height X depth
Volume (
Net Int.
)
8.5 l
21.2 l
16” x 9” x 6.75”
406mm x 229mm x 171mm
8W1-8
15” x 9” x 15.5”
381mm x 229mm x 394mm
2.5” X 11.7”
0.30 ft
3
64mm X 297mm
0.75 ft
3
width X height X depth
Volume (
Net Int.
)
8.5 l
21.2 l
Be sure to allow 0.75 inches (19mm) for pole vent clearance on this driver.