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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
output.Low level = RCA is to prefer for the best sound
quality.
Important
On CA20/21 use either the low level or the 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 me-
ters). 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 input socket A & B. CA40 and CA50 is also
equipped with separate inputs for channel C & D.
CA 50 has also a separate input for channel E.
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.
CA 20 & CA21
High Input
Hi level input
plug on amp.
Automatic turn on when using high level in-
put.
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.
CA40
The CA40 four channel amplifier is connected
likewise, however we have four channels.
You can feed two channels from RCA and two
channels using high level input from rear speaker
cables.
High Input
(A/B Ch)
Hi level input
plug on amp for CH A & B.
High Input
(C/D Ch)
Hi level input plug on amp for CH C & D.
CA50 uses this plug for CH A, B, C & D.
CA50
The CA50 five channel amplifier is connected
likewise, however only Channels A, B, C and D can
be fed with high input. The signal is then connected
internally to channel E.
Parallel input on CA40 & CA50
Parallel Input
White: A ch.+
White/Black: A ch.-
Gray/Black: B ch.-
Gray: C ch.+
RCA Output
A
B
Violet: C ch.+
Violet/Black: C ch.-
Green/Black: D ch.-
Green: D ch.+
In PCD position the A/B and C/D
input connectors are internally
connected in parallel.
In OFF-position you must use
Off PCD
dual signal cables.
On CA50 the PCDE position
connects the CD input with the
input for channel E.
Input
Output
Use RCA Outputs to
A
connect additional
amplifiers (not available on
CA50).
B
CA20, 21, 40 & 50
White: A ch.+
White/Black: A ch.-
Gray/Black: B ch.-
Gray: C ch.+
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