Rockford Fosgate 400x4 operation manual Engine Noise

Symptom		Diagnosis		Remedy
Engine Noise	Noise	is radiating	into	Check connections, run the
	RCA signal cable.			RCA cables on a different
				route away from sources of
				high voltage.
	Bad component in the sig-			Check connections, bypass
	nal chain.			additional components
				(crossovers and equalizers)
				between the source	unit
				and the amplifier. Connect
				one component at a time
				to determine the culprit.
				Repair or replace compo-
				nents as necessary.
	Noise	is radiating	into	Disconnect existing speak-
	speaker cables.			ers and connect a test
				speaker to the output ter-
				minals of the amplifier. If
				noise is gone, reroute the
				speaker cables away from
				sources of high voltage.
	Multiple grounds in the			Check ground connections
	audio system.			and connect amplifiers, sig-
				nal processors, and other
				components to a central
				location or try a different
				grounding point on	the
				chassis.
	Ground loop between			Check connections,	dis-
	source unit and antenna.			connect antenna from
				source unit. If noise is gone,
				install an antenna ground
				loop isolator.

•If noise persists, see your Authorized Rockford Fosgate Dealer.

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