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COMPVT SUBWOOFER
5
design. Use the outer dimensions of the port and multiply “X
x Y x Z”, convert to cubic feet, for example the CompVT12
vented compact design’s external port dimensions are, using
3/4” (1.9cm) MDF: [ (12.5” + 1.5” total MDF wall thickness)
x (2.5” + 1.5” total MDF wall thickness) x 20”] x (1 ft3 / 1728
in3 ) = .65 ft3, and add this number to the internal volume of
the enclosure, CompVT12’s 1.75 ft3 + .65 ft3 = 2.4 ft3. See
Figure 5. Due to the necessary length of these ports, you may
want to fold the port along the bottom and back walls. It will be
impractical to use round ports for these designs. Do not install
a port opening against a solid surface, such as an internal
brace, back-panel or trunk wall, seat or interior panel of your
vehicle. The port opening must remain unobstructed. Use the
smallest dimension of the rectangular port as the minimum
amount of space between the port
opening and any solid surface to insure
unrestricted airfl ow.
If you prefer an ultra-smooth bass
response, you should loosely fi ll your
CompVT enclosure with poly-fi l stuffi ng.
Ported designs will require covering the
end of the port (located inside the box)
with grill cloth, chicken wire, or expanded
metal to prevent the poly-fi l from exiting
the port. The use of poly-fi l will slightly
decrease effi ciency, but will deepen and
extend the low frequency output.
For more advice on box building, refer
to your Authorized Kicker Dealer, or
click on the Support tab on the Kicker
homepage, www.kicker.com. Please
e-mail support@kicker.com or call
Technical Support at (405) 624-8583 for
specifi c or unanswered questions.
CompVT Subwoofer - Covered by
one or more of the following patents:
U.S. Pat #’s 6,611,604, 6,731,773
D473,216, D456,386, D449,293,
D355,193, Taiwan Pat. #162,154;
Other U.S. and foreign patents pending.
VENTED ENCLOSURE APPLICATIONS
These boxes are the enclosure of choice for outrageous street bass and high performance SPL contests.
If space is not a problem and you want to get the most from your CompVT, try one of these ported
designs. You will not be disappointed. CompVT subwoofers will handle massive amounts of power in
any of the recommended enclosures, minimum or maximum. The smaller enclosures are best for use in
limited-space applications. The larger recommended enclosures will yield slightly more bass at the lowest
frequencies.
The ported Compact design increases bass effi ciency and fi ts in many space-limited applications.
Although it is the smallest recommended ported enclosure, the output from 30 to 80 Hz will be
considerably higher than that of any sealed box.
The SPL / Deep Bass ported design has even more output in this crucial frequency band. The SPL /
Deep Bass is the largest and most effi cient enclosure design.
BOX BUILDING NOTES
Use 3/4” (1.9cm) or thicker MDF (medium density fi berboard) and seal the joints with silicone. Use the
“template” inside your CompVT’s shipping carton to mark the mounting hole, then cut directly on the line.
These designs need internal bracing. Add triangular bracing between each of the larger unsupported
panels. See Figure 4.
All the cubic feet (L) measurements in this manual include the displacement of the woofer. For the vented
enclosures the displacement of the port must be calculated and added to the internal volume of the fi nal
stillwaterdesigns
P.O. Box 459 • Stillwater, Oklahoma 74076 • USA • (405) 624–8510
Figure 4
D
D
D
D = 3” x 3” for CompVT12
D = 2” x 2” for CompVT8/10
Sound Check: Poor bass response? Check the system phasing by reversing the positive and negative
speaker connections on the subwoofer. If the bass improves, then the subwoofer was out of phase in
reference to the rest of the audio system.
Vented Compact CompVT8 CompVT10 CompVT12
Box Volume, ft
3
(L) .8 (22.7L) 1.25 (35.4) 1.75 (49.6)
Port Opening, in x in (cm x cm) 1.5 x 8 (3.8 x 20.3) 2 x 10.5 (5.1 x 26.7) 2.5 x 12.5 (6.4 x 31.8)
Port Length, in (cm) 20.75 (52.7) 20 (50.8) 20 (50.8)
Power Handling, RMS 75 200 300
Vented SQ CompVT8 CompVT10 CompVT12
Box Volume, ft
3
(L) 1.2 (34) 1.75 (49.6) 2.25 (63.7)
Port Opening, in x in (cm x cm) 2 x 8 (5.1 x 20.3) 2.5 x 10.5 (6.4 x 26.7) 3 x 12.5 (7.6 x 31.8)
Port Length, in (cm) 19.125 (48.6) 20 (50.8) 20.5 (52.1)
Power Handling, RMS 75 200 300
Y
X
Z
Figure 5
Clearance Plate
1/16” (2mm) recess
6 1/2”
(16.7cm)
recess outer
diameter
5 1/4”
(13.3cm)
cut out
diameter
Drill with #29 (0.136”,
3.5mm) bit, then
countersink with 1/4”
(6mm) bit, six holes
equally spaced. Use
the clearance plate as
a template.
Figure 3
2010 CompVT d01.indd 4-52010 CompVT d01.indd 4-5 11/4/2009 5:06:31 PM11/4/2009 5:06:31 PM