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. Connect the
black wire to minus ground.
XM20
On this model you connect as in this example:
XM40
The four channel amplifier is connected likewise,
however we have four channels.
You can feed two channels from RCA and two chan-
nels using high level input from rear speaker cables,
or all channels from high level input.
Important
Use either the low level or high level input, do not
use both at same time.
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).
Connect to input socket
CH1 / CH2 on XM20.
XM40
has dual inputs
CH1 / CH2 / CH3 / CH4
De-
pending on your chosen configuration you can use
either two separate RCA cables, or a single RCA
cable together with an Y-split to connect both inputs.
Remote terminal ( REM )
Low level 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.
4
For RCA cable signal input:
Connect the radio power antenna lead = remote
turn on/off from the car stereo to the amplifier
remote connection. This turns on the amplifier
whenever the car stereo is turned on.
You can either use the built in remote cable in the
RCA cable itself or use a separate cable.
Sometimes a small disturbance may
enter the amplifier coming from the remote voltage
, through the built in remote wire and into the RCA
cable. Thus we recommend to use a separate
remote wire and run the RCA lead separate from
remote wire, power cables and speaker cables.
If there is no remote voltage available
from the stereo, you must connect to the ignition
key through the radio or any accessories fuse.
To head unit Power
Antenna lead or
remote output.
A cable up to
AWG 7 (10 sq
mm) fits the
amplifier re-
m o t e ( R E M )
terminal.
High Level Input wiring
BATT+ REMOTE GND
For High Level input:
Most headunits are pre-installed from the car factory
and have no RCA output, in this case you can take
the signal from the speaker output instead.
The remote wire must be connected as described
in the text to the left.
Hi level input plug.
Green: CH2 +
Green / black: CH2 -
Black: To ground
Grey / black: CH1 -
Grey: CH1 +
Hi level input plug.
Green: CH1 +
Green / black: CH1 -
Black: To ground
Grey / black: CH2 -
Grey: CH2 +
Hi level input plug.
Green: CH3 +
Green / black: CH3 -
Black: To ground
Grey / black: CH4 -
Grey: CH4 +
CH1 CH2
+ - - +
HIGH INPUT
CH2 CH1
+ - - +
HIGH INPUT
CH4 CH3
+ - - +
HIGH INPUT
