Operation Manual
POWER
Amplifiers
Indicators
and
Controls
Power Indicator (POWER)
The power indicator provides a visual indication that the amplifier
is
turned on.
Input Level Control (LEVEL)
The input LEVEL control matches the output
of
your radio to the input
of
the
amplifier. After the installation
is
complete, make sure the input level control on
the amplifier is turned down all the way (counter-clockwise or all the way to the
left). Play a tape or CD (make sure bass and treble settings or Bass EQ are
flat) and turn the volume up slowly until you just start to hear distortion. Back
the volume down just a bit.
On
the amplifier, slowly turn up the input level
control (clockwise or to the right) until you just start to hear distortion, then
back it down a bit. Now your radio and amplifier levels are matched.
BASSEQ
The Bass EQ
is
continuously adjustable from 0 to
+12dB@
45Hz. Adjusting
the Bass Boost level allows different subwoofer/enclosure combinations to be
equalized. Use this control to increase the level
of
low bass available from your
subwoofer/enclosure combination. Ported and Band Pass enclosures should
be
limited to about +6dB to +9dB
of
boost. Sealed enclosures should be able
to accept the full +12dB
of
boost,
if
necessary. The full +12dB
of
boost should
be reserved for special applications since improper use
of
the Bass Boost
could damage your subwoofers at high volumes.
Low
Pass Filter (LPF)
The Low Pass Filter controls adjust the crossover point. Typical crossover
is
between 60Hz and 80Hz for ported and sealed enclosures. Bandpass boxes
will typically use a higher crossover setting between 125Hz and 150Hz. Since
musical tastes vary, you should play music that you would normally listen to
in
your vehicle, with the above settings as a starting point. If necessary, set the
crossover by ear.
High Pass Filter (HPF)
The high pass filter will limit the low frequencies being transmitted to your
speakers. This can
be
useful
in
number
of
situations. For example,
if
you
selected the high pass filter and set the crossover to 40Hz, then you would
have an infra-sonic (sub-sonic) filter at 40Hz, which would be useful with
certain enclosure/subwoofer combinations that were tuned between 45Hz and
50Hz. Other uses might include limiting the low frequencies to smaller
8
speakers (6 1/2", 6 X 9", etc.) by adjusting the crossover to a higher setting
(80-1
OOHz).
Phase Switch
The
Phase
Switch
is
selectable
to
0
degrees
(normal
polarity)
and
180
degrees
(inverted polarity).
Depending
on
the
size
and
location
of
your
subwoofer
and
main
speakers,
you
may
need
to
adjust
the
Phase
Switch
to
provide
the
best
blend in
the
midbass
(60 - 150Hz).
To
determine
the
appropriate
phase
setting,
select
either
regular
(0°)
or
inverted
(180°)
and
perform
a
sound
test. Listen
carefully
to
the
sound
quality
while
playing a
CD
with
male
voices
and/or
low
bass
such
as
percussion
or
bass
lines,
then
select
the
position
that
produces
the
fullest
and
most
dynamic
bass. You
may
need
to
adjust
the
Input
Level Control
and
the
Low
Pass
Filter control
after
setting
the
Phase
Switch.