Owner's Manual
Table Of Contents
PRACTICE
SAFE
SOUNDTM
~CAUTION:
SAFETY
Before installation, disconnect
the
battery
negative
(-)
terminal
to
prevent damage
to
the
unit, fire and/or possible injury.
CARTON CONTENTS
(I)
Punch
P2
Series Subwoofer
(I)
Painted Aluminum decorative trim ring
(8) Socket head
wood
screws
(
I)
Socket head driver bit
120.0
Continuous
exposure
to
sound pressure levels
over
IOOdB
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.
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.
Box
Volume
Height"
x
Width"
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
this must be subtracted from
the
outside dimensions
to
determine
the
internal 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.
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
The graph shown here
is
a sample
of
how
the
F3
drop-off
point
differs
between
sealed
and
vented
enclosures.
110.0
100.0
90.0
80.0
70.0
80.0
10.0 20.0 40.0
._.
Sealed Box _ Vented Box
2
60.0 80.0 100.0
Frequency. Hz
200.0
1-
1000,0