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 Ω
4 Ω
6.89 Ω
Znom (nominal impedance):
Pt (continuous thermal power handling):
8 Ω
100Watts
100 Watts
*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”!
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
16” x 9” x 6.75”
406mm x 229mm x 171mm
16” x 9” x 6.75”
406mm x 229mm x 171mm
Sealed
Enclosure
Ported
15” x 9” x 15.5”
381mm x 229mm x 394mm
15” x 9” x 15.5”
381mm x 229mm x 394mm
Enclosure
2.5” X 12.4”
64mm X 318mm
2.5” X 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 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).
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