Speaker outputs
Some of these amplifiers are multi channel amplifier design. Meaning it has
more than one channel of speaker outputs. It is equipped with a large block
style terminal for speaker connection. Make this connection carefully and
neatly.
Strip your wire back and twist the exposed leads
and insert them into the block terminal while
being
careful that there is no loose or frayed
strands of wire. Tighten the Allen head screw
down on the terminal till the wire is tightly
secured in place. If the wires ever come in
contact
with
each
other
the
amplifier
will
go
into
protection mode.
Know your total ohm load before you make any
connections.
3
Installation Instructions
1. Before you
start
,
disconnect
the
negative
cable
from
the
car
battery
.
Tape
up
the
end
so
it
is
isolated
from
the
battery.
2. Run an appropriate gauge wire from the battery to the amplifier. Plan this
part of the installation carefully. This cable will carry very high current. If it
should short to the body and it is not properly fused it could catch fire.
3. Connect the power
wire
to
the
battery
using
a
fuse
capable
of
the
total
current
load
of
all
amplifiers
connected
.
Don
'
t install the fuse yet
.
Wait until
the
end
.
Locate
the
fuse
as
close
as
possible
to
the
battery
.
4. Find the closest clear metal area to the amp for a ground. Sand, grind or
scrape all paint and undercoating from the body and screw the ground
securely in place.
It
is
advisable
to
test
the
ground with an ohmmeter between the ground
cable and the negative battery cable to insure a good low resistance
connection. Some alloys used in modern cars do not offer the best ground.
If you believe this is the case consult with the vehicle manufacturer.
5. Run the speaker wire to the speakers. It is advised that you leave some
extra wire at this point. You can
“
clean it up
”
later.
6. If you haven
'
t already done so, mount the amp now.
7. Connect the power and ground to the amplifier.
You should
install the fuse at the battery only
after
this
step
.
FRONT
REAR
L
R
BRIDGE
Amplifiers are generally mounted in the hatch/trunk area of a car or SUV, and
under or behind the seat of most pick up trucks. Select a location that will
provide adequate ventilation for the amplifier. Avoid mounting the amplifier
with the fins facing down. The fins should be facing up, either vertically or
horizontally. Secure the amplifier with the screws provided.
WARRANTY!
Before securing the amplifier, inspect the mounting location carefully to ensure
that you do not drill into or damage any electrical, hydraulic, fluid, or fuel lines.
2
Input Section
Because of the wide range of head unit output configurations all
IMPACT
amplifiers have an adjustable input gain (sens). The gain is not a volume or a
power limiting control like a throttle. It makes the amp more sensitive to input
from the stereo. With the gain up the amp will reach full output at a lower
volume setting on the deck. At higher gain settings the amp also becomes more
sensitive to noise from the car
'
s electrical system. Try to run the gain at the
lowest setting possible for your system.
There is
no
correct
gain
setting
.
As
speakers
require
different
power
demands
to
reach
the
same
output
,
the
gains
most
often
need
to
be
used
to
compensate
for
these
differences
.
If
you
try to set all the gains at half way you
would probably find the system doesn
'
t
sound very good. Using good judgment
and listening carefully to each speaker is
still the best way to tune a system.
Crossover controls
A crossover is a device that removes unwanted frequencies from a speaker or
amplifier. A tweeter can easily
be
destroyed
by
bass
frequencies if
they
are
not filtered out. Likewise a subwoofer will not sound natural if it is playing
midrange notes. A crossover removes these sounds from the speaker as you
might guess.
Careful adjustment in needed to ensure
that all the speakers are playing the
right sounds and that you
with
have left
no
“
holes
”
or low spots in the
frequency response.
R
L
FRONT
REAR
INPUT
SENS
MIN
MAX
LINE OUT
REAR
L
R
SENS
MAX
INPUT
FRONT
SENS
MIN
MAX
X-OVER
FREQ
40Hz
400Hz
L
R
X-OVER
LPF
HPF
FLAT
INPUT
FRONT
