Clarion APX2181, APX4361 Amplifier shuts down after playing for a period of time, Distorted audio

APX_DPX Amps.qxd 2/6/2008 11:53 AM Page 22

English

Amplifier shuts down after playing for a period of time

•Thermal protection circuits are shutting the amplifier off: Check the location for adequate ventilation. Relocate amplifier as required. Consult an authorized Clarion audio dealer.

Distorted audio

•Gain is not properly set: review the instructions for setting the gain.

•Speaker cones are damaged: inspect each speaker cone for signs of damage, such as a frozen cone, burnt smell, separated or ripped surround or separated spider.

Amplifier fuse keeps blowing

•	Incorrect wiring or short circuit: review the installation and check all wiring
	connections.
		Fuse rating table
•	Amplifier being driven too hard: Turn down the
	volume, gain or bass boost.	Model	Fuse rating
•	Undersized or faulty fuse installed: Replace the	APX2181	30 Amp
	amplifier fuse with the same rating fuse as the one
		APX4361	50 Amp
	that shipped with the unit.
		DPX2251	50 Amp
Note:
		DPX1851	90 Amp
	The DPX11551 ships with a 200 Amp, ANL-type
	fuse; mount it external to the unit, near the battery.	DPX11551	200 Amp

Whining noise when engine on

•RCA cables too close to the power wire: Separate RCA and power cables. Ground loops are caused by a mismatch in the ground potential (voltage) between two sources. Current flows through the shield of the RCA cable and is quickly picked up by the amplifier. There are several ways to solve this problem:

•Re-ground the amplifier to a more electrically conductive location.

•Re-ground the head unit to a more electrically conductive location.

•Run a ground wire from the head unit to the amplifier ground.

•Upgrade or replace the ground wire on the battery and alternator.

•Run a ground cable from the negative terminal of the battery to the amplifier.

•Wire the entire audio system using a single connection point to the chassis.

•Induced noise: Relocate components away from electrical noise sources:

•Engine control computers.

•ABS brake control modules.

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