Audiovox UPA224, UPA424 Input Wiring & Controls, Low Level Input LOW-INPUT, Input Level Level

UPA224/UPA424

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.

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

	LOW-INPUT		HIGH LEVEL
LEVEL	CH1	CH3	CH1/2INPUT CH3/4INPUT

UPA424	POWER
	MIN	MAX		+ -	+ - + - + -
		CH2	CH4
			LOW-INPUT	HIGH LEVEL
	LEVEL		CH1	CH1/2INPUT
UPA224	POWER
	MIN	MAX		+ -	+ -

CH2

6

NOTE: The black wire from the high-level input harness MUST be grounded for the high-level input circuit to operate properly.