Owner's Manual

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 Comp, try one of these ported designs.
You
will
not be disappointed. Comp 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.
Vented
Compact
Comp12D4
Comp15D4
Box
Volume,
fP
(L)
1.75
(49.6)
3 (85)
Port
Opening,
in
x
in
(em
x
em)
2
X
12.5
(5.1
X
31
.8)
2.5
X
15.5
(7
X
39.4)
Port
Length,
in
(em)
16
(40.6) .
17 (43.
2)
Power
Handling,
RMS
200
300
Vented
SO
Comp12D4
Comp15D4
Box
Volume,
fP
(L)
2.25
(63.7)
4 (113.3)
Port
Opening,
in
x
in
(em
x
em)
2
X
12.5
(5.
1
X
31
.8)
3
X
15
..5
{7. 6
X
39.4)
Port
Length,
in
{em)
16.375
(41
.6)
16
.25
(41
.3)
Power
Handling,
RMS
200
300
The ported Compact design increases bass efficiency and
fits
in
many
space-limited applications.
Although
it
is
the
smallest
recommended ported
enclosure,
the output from
30
to
80Hz
will
be
considerably
higher than that of any
sealed
box.
The
SPL
I
Deep Bass ported design has even more output
in
this
crucial
frequency band. The
SPL
I
Deep Bass
is
the
largest and most efficient
enclosure design.
INFINITE
BAFFLE
MOUNTING
The infinite
baffle
mounting method
effectively utilizes
the rear deck and trunk space of most sedan type
vehicles. The Comp subwoofer does not require a
sealed enclosure
for thumpin' performance.
Carefully
install
the subwoofer
in
the
baffle.
Mark the rear deck or
parcel shelf
for the hole
cut-out diameter of the
subwoofer and cut the
hole.
The rear
deck
may need to be reinforced to
help hold
the weight of the
subwoofer and to keep
it
from
flexing
during
playback.
Mount
314"
(1
.9
em)
thick MDF (Medium Density
Fiberboard) to the bottom of the deck. Mark the MDF and cut the
holes.
If
MDF
is
not
available
in
your
area, use high grade plywood.
It
is
important to
isolate the sound coming
off
the front of the subwoofer
from the sound radiating from the back of the subwoofer. This
isolation
is
usually accomplished by using
the driver
in
a factory speaker location,
or
in
a
location
with a
semi-isolated
rear chamber.
Note:
If
mounting
in
trunk space or other compartments of the
vehicle, pay attention to cable
lines,
trunk springs, hinges
and seat mechanisms that
could
cause problems with the operation of the vehicle or stereo system.
Carefully lay
the
stereo system cables; pay attention to seat fasteners and other items that
could harm the cables.
BOX
BUILDING NOTES
Use
3/4"
(1
.9cm) or thicker MDF (medium density fiberboard) and
seal
the joints with
silicone.
Use the
"template" inside your Comp'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
4
COMP
SUBWOOFER