Owner's Manual
Table Of Contents
SAFETY
~CAUTION:
Before installation, disconnect
the
battery
negative (-) terminal
to
prevent damage
to
the unit, fire
and/or
possible injury.
PRACTICE
SAFE
SOUND™
Continuous exposure
to
sound pressure levels over I
OOdB
may
cause permanent hearing loss.
High
powered auto sound systems
may
produce sound pressure levels well
over
130dB. Use common
sense and practice safe sound.
RECOMMENDED
ENCLOSURES
This manual outlines
two
specific types
of
enclosures
that
provide
distinctly different performance. This section
is
to
help you decide
which type
is
best for your application.
SEALED
ENCLOSURES
Sealed enclosures
are
the
simplest
to
build. The
most
important
part
of
building a sealed enclosure
is
to
make sure
that
the
enclosure
is
airtight.
Using glue and some type
of
sealant on
all
seams
will
ensure solid
construction and prevent air leaks. The box volume
will
directly impact
the
performance
of
the
speaker. Larger enclosures
will
provide flatter
response and
deeper
bass
where
smaller boxes
will
provide a bump
in
the
response curve and generally higher
output
for greater
SPL.
Advantages
of
sealed
enclosures:
Small
enclosures
Linear (Flat) response
No
port
noise
High
power
handling
at
all
frequencies
Excellent for sound quality
Extended low frequency
output
when compared
to
vented enclosures
VENTED
ENCLOSURES
Vented enclosures vary only from
the
sealed enclosure in
that
a vent
or
port
is
added
to
"tune"
the
enclosure.
The
enclosures recommended are
designed for
great
overall performance. Larger boxes tend
to
be easy
to
tune
to
lower frequencies while medium and small boxes
are
easier
to
tune
to
higher frequencies. The vented design
is
less linear
in
response than
the
sealed box but with noticeably more
output
at
the
tuning frequency.
Advantages
of
vented
enclosures:
Higher average
output
than sealed
Tuning frequency can
be
easily adjusted
by
changing
port
length
Deep
bass response with lower
power
requirements
Great
for
high
output
with limited
power
120.0
11
0.0
1
00
.0
90
.0
80
.0
70
.0
600
CARTON
CoNTENTS
(I)
Punch
P3
Shallow Series Subwoofer
(I)
Painted aluminum decorative trim ring
(8) Socket head
wood
screws
(I)
Socket head driver bit
BUILDING
AN
ENCLOSURE
To
work
properly,
the
walls of
the
enclosure must be rigid and
not
flex
when subjected
to
the
high
pressures generated
by
the
speaker's
operation. For optimum performance,
we
recommend using 3/4"
MDF
(Medium Density Fiberboard) and internal bracing. The enclosure should
be glued
together
and secured with nails
or
screws.
CALCULATING
VOLUME
Calculating volume
is
merely a
matter
of
measuring
the
dimensions
in
inches and using
the
formula: H x W x D divided
by
1728 (cubic feet).
See block below.
BoxVolume
Height"
xWidth"
x
Depth"
Divided
by
(cubic
feet)
1728
If
two
facing sides
are
of
uneven length, add them
together
and divide
by
two
to
take
the
average. Using this number will
give
you
the
volume
without
the
necessity
of
calculating
the
box
in
sections and adding
the
sections together. The thickness
of
the
baffle material reduces
the
internal
volume
so
th
is must be subtracted from
the
outside dimensions
to
determine
the
inter
nal
volume. The speaker itself also reduces
the
internal volume. The amount of air displaced by each model
is
listed
on
the
specification
sheet
and should also
be
subtracted from
the
gross
volume calculation.
VENTED
vs
SEALED
The graph shown
here
is a sample
of
how
the
F3
drop-off
point
differs
between
sealed
and
vented
enclosures.
10.0
20
.0
40
.0 60.0
80
.0 100.0
200
.0
1
000
.0
•-•
Sea
led
Box
-
Ve
nt
ed
Box
Frequency,
Hz
2