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High Level Input for ch 1, 2, 3 & 4
Connect left and right speaker wires coming from
the car stereo to the high level input as shown. You
must connect both plus and minus as the inputs
are balanced, connecting plus only gives lower level
and bad sound quality. By changing the polarity of
plus and minus, you can change the phase. The
input signal to the sub channel (CH5) is also
fed from the High level inputs if the SUB INPUT
selector switch is in the upper position.
High level input sockets
.
Automatic turn on when using high level input.
With the ”Input selector switch” set to High level
and the ”High level Auto Start” switch set to IN,
the amplifier turns on automatically on high input.
You don´t need to connect a separate remote wire
from your head unit. If you want to use high level
input but use a remote start wire, just set the ”High
level Auto Start” switch to OUT. Read more on
next page.
Input and controls
Input Wiring
Inputs may be low level from the RCA output of the
car stereo, or high level from the car stereo speaker
output. Low level = RCA is to prefer for the best sound
quality.
5
RA50
Hi level input plug.
Low level input
Use a pair of shielded stereo audio cables with RCA
type jack. Most trunk-mount amplifiers need a 20
feet RCA cable ( appr 5 – 6 meters). Most under
the seat installations require 12 feet ( 2 – 3 meters)
RCA cables. Avoid placing the RCA cable close to
speaker cables, power
cables and remote control
cable. Connect to RCA input
sockets.
Set the input selector switch
to position ”Low level”.
SUB INPUT selector
switch in bottom plate
The amplifier has a separate input for the sub
channel (CH 5). The signal to the sub channel can
either be fed from the input for CH 1 & CH2, or
separate through the SUB IN RCA connector.
There is a switch under the bottom plate.
With this switch in the upper position the sub
channel gets it´s signal from CH1 & CH2 inputs.
With the switch in lower position, the sub channel
(CH5) is fed from the separate SUB input.
This is useful if you prefer to use the separate
subwoofer output coming from many head units. If
your head unit has only one RCA preout, set the
selector to the upper position instead.
CH2 CH1
Green: Left +
Black: Left -
Black: Right -
Grey: Right +
CH4 CH3
Hi level input plug.
Hi level input
socket on
amp.
Green: Left +
Black: Left -
Black: Right -
Grey: Right +
Input Mode Selector
CH1 from Input 1
CH2 from Input 2
CH3 from Input 3
CH4 from Input 4
Sub CH5 from
Input 1+2
CH1 from Input 1
CH2 from Input 2
CH3 from Input 3
CH4 from Input 4
Sub CH5 from
SUB INPUT
Hi level input
socket on amp.
Hi level / Low level input selector switch
To ensure best possible performance from the
amplifiers a switch is installed to select between Hi
and Low input.
When using High Level input:
Push in the button to position
”High”
When using Low level input:
Push out the button to position
”Low”
NOTE!
When using high level
input the selector
must be in it´s upper
position to feed the
sub channel with sig-
nal.
5


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