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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 out-
put. Low level = RCA is to prefer for the best sound
quality.
Important
On MRA22 use either the low level or high level
input, do not use both at same time.
Low level input
Use a pair of shielded ste-
reo audio cables with RCA
type jack. RCA cables are
available in different lengths
up to 5,5 meters.
Avoid placing the RCA cable
close to speaker cables,
power cables and remote
control cable. Connect to input socket A/B.
MRA31 has also a separate input (C) for the mono
sub channel.
High Level Input
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.
MRA 22, MRA31
High Input
(C/D Ch)
Hi level input
plug on amp.
MRA31
On MRA31 the high level signal is fed internally to
channel C when using high level input.
Automatic turn on when using high level input.
With the Hi/Low input swich set to Hi, the amplifier
turns on automatically on high input. You dont need
to connect a separate remote wire from your head
unit.
Parallel input on MRA31
On MRA31 the PC position
Parallel Input
MRA31
internally connects the A/B input
with the input for channel C.
Off PC
4
White: A ch.+
White/Black: A ch.-
Grey/Black: B ch.-
Grey: B ch.+
RCA Output
Input
Output
Use RCA Outputs to
A
A
connect additional
amplifiers (not available on
MRA31).
B
B
Hi / Low level input 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
"Hi Level"
When using Low level input:
Push out the button to position
"Low Level"
If the switch is set to wrong position, the amplifier
still works, but the risk for disturbances or distortion
increases.
Fuses
MRA31 uses two 30 ampere
ATC blade type fuses.
MRA22 uses one 25 A fuse.
Power Light / Protect light
The power light (green ) comes on when
the amplifier is turned on.
Power
(Green)
The protect light ( red ) comes on
when the amplifier shuts down from
Protect
(Red)
overheating, or a short circuit ( spea-
ker failure)
MRA22, MRA31
Hi level
Low level
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