VENTED
ENCLOSURE APPLICATIONS
CompVR 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
vented minimum design increases bass efficiency and fits
in
many
space-limited applications.
Although
it
is
the smallest
recommended vented
enclosure,
the output from
30Hz-80Hz
will
be
considerably higher than that of a
sealed box. The maximum vented design has even more output
in
this
frequency band. The maximum vented enclosure
is
the
largest and most efficient design.
Vented Minimum
CVR10
Box
Volume,
ft
3
[L]
1.25 [35.4]
Port Opening,
in
x
in
[em x em] 2X10.5 [5.1X26.7]
Port Length,
in
[em]
20
[50.8]
Power
Handling,
RMS
300
Vented Maximum
CVR10
Box
Volume,
ft
3
[L]
1.75 [49.6]
Port Opening,
in
x
in
[em x em]
2.5X10.5 [6.4X26.7]
Port Length,
in
[em] 20
[50.8]
Power
Handling,
RMS
300
BOX
BUILDING
NOTES
Use 3/4"
(1
.9cm) or thicker MDF (medium density
fiberboard) and
seal
the joints with
si
li
cone.
Use the
"template"
inside your CompVR'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
3.
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
final
design.
Use the outer dimensions of the port and
multiply
"X
x
Y
x
Z",
then convert to cubic feet. For
example,
the
CVR12
Vented Compact design's
external
port
dimensions
are,
using
3/4"
(1
.9cm) MDF:
CVR12 CVR15
1.75
[49.6]
3 [85]
2.5X12.5.(6.4X31.8]
2.75X15.5 [7X39.4]
20
[50.8]
25.75
[65.4]
300
500
CVR12 CVR15
2.25 [63.7] 5 [142]
3X12.5 [7.6X31 .8] 3X15.5
[7
.6X39.4]
20.5
[52.1]
22 [55.9]
300
500
Figure 3
D
=
3"
x
3"
for CVR15,
CVR12
D
=
2"
x
2" for CVR10
(12.5"
+
1
.5" total
MDF
wall thickness)
x
(2.5"
+
1
.5"
total
MDF
wall
thickness)
x
(20")
x
(1
ft
3
I
1728
in
3
)
=
.65
ft
3
,
Then, add this number to the
internal volume of the
enclosure.
1
. 7 5
ft
3
+ .
65
ft
3
=
2.
4
fF
See
Figure
4.
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.
4
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