JL Audio Speaker Subwoofe User Manual

Subwoofer Specifications  
8W1-4  
8W1-8  
35.7 Hz  
0.385  
Fs (free-air resonance):  
Qts (total speaker “Q”):  
Qes (electrical “Q”):  
33.2 Hz  
0.345  
0.355  
11.5  
0.414  
Qms (mechanical “Q”):  
6.247  
ft3  
ft3  
Vas (equivalent compliance):  
Xmax (linear excursion one-way):  
Efficiency (1W/1m)*:  
Sd (effective piston surface area):  
Re (DC resistance):  
0.90  
0.282  
25.5 liters  
0.78  
0.282  
22.1 liters  
7.2  
mm  
7.2  
mm  
in.  
in.  
86.0 dB  
85.6 dB  
in2  
m
0.0198  
in2  
m
30.7  
2
2
30.7  
0.0198  
3.34  
4 Ω  
6.89 Ω  
Znom (nominal impedance):  
Pt (continuous thermal power handling):  
8 Ω  
100Watts  
100 Watts  
*Efciency (1W/1m) is not an accurate indicator of a subwoofers output capability and should not be used as a  
comparison to other subwoofers to determine which one is louder!  
Physical Dimensions  
D
mm  
mm  
mm  
mm  
mm  
in.  
in.  
in.  
in.  
in.  
ft3  
8.25  
7
209.55  
177.8  
Frame Diameter (A):  
Mounting Hole Diameter (B):  
Mounting Depth (C):  
Overall Depth (D):  
3.75  
4.25  
4.5625  
0.025  
95.25  
B
A
E
107.95  
115.88  
0.707  
Magnet Diameter (E):  
Displacement:  
liters  
C
Be sure to allow 0.75 inches (19mm) for pole vent clearance on this driver.  
Normal Recommended Enclosures (single driver)  
Model  
8W1-4  
8W1-8  
Volume (Net Int.)  
width X height X depth  
Volume (Net Int.)  
width X height X depth  
0.30 ft3  
8.5 l  
0.75 ft3  
21.2 l  
0.30 ft3  
8.5 l  
0.75 ft3  
21.2 l  
16x 9x 6.75”  
406mm x 229mm x 171mm  
16x 9x 6.75”  
406mm x 229mm x 171mm  
Sealed  
Enclosure  
Ported  
15x 9x 15.5”  
381mm x 229mm x 394mm  
15x 9x 15.5”  
381mm x 229mm x 394mm  
Enclosure  
2.5X 12.4”  
64mm X 318mm  
2.5X 11.7”  
64mm X 297mm  
Port  
(inside dia. X length)  
H
H
W
D
W
D
Ported Enclosure  
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 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).  
 

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