UPA224/UPA424
6
CH1
CH2
LOW-INPUT
HIGH LEVEL
CH1/2INPUT
+ -
+ -
LEVEL
MAX
MIN
POWER
CH1/2INPUT
HIGH LEVEL
+
CH3
LOW-INPUT
-
-
+
MIN
MAX
LEVEL
CH1
CH2
CH4
+
+
-
-
CH3/4INPUT
POWER
INPUT WIRING & CONTROLS
Low Level Input (LOW-INPUT)
Low level (RCA) input is preferred for best
performance. Most trunk/hatchback
installations require a 15-20 foot RCA cable,
while pickup trucks and under-seat mounting
require a 6-12 foot RCA cable. Connect an
RCA cable from your receiver to the RCA input
on your amplifier.
Input Level (LEVEL)
The input level control matches the radio output
to the amplifier input. After installation, turn the
input level control all the way to the left, then
insert a tape or CD. Make sure the bass and
treble or EQ settings are flat, then turn the
volume up slowly until you hear distortion. Turn
the volume down slightly. To match the amplifier
input, slowly increase the amplifier input level
control (turn clockwise) until you hear distortion,
then turn it down slightly. After completing this
process, your amplifier levels will be matched.
High Level Input (HIGH LEVEL)
High level input should be used when an RCA
output is not available from the receiver.
NOTE: Only connect the RCA OR High-Level
Input – not both at the same time.
Connect the speaker outputs from the receiver
to the high level input connector, then plug the
connector(s) into the “HIGH INPUT” outlet(s) on
the end of the amplifier.
NOTE: The black wire from the high-level
input harness MUST be grounded for the
high-level input circuit to operate properly.
Wiring Harness Color Codes
White Wire
Left Channel Positive (+)
White/Black Wire
Left Channel Negative (-)
Gray Wire
Right Channel Positive (+)
Gray/Black Wire
Right Channel Negative (-)
Black Wire
Chassis (Power) Ground
UPA424
UPA224
Summary of Contents for Phase Linear UPA224
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