Rockford Fosgate 1000, 400, 360 Symptom, Remedy, Diagnosis, Engine Noise, using high level, inputs

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Symptom	Diagnosis			Remedy
Engine Noise	Noise is radiating into RCA			Check connections, run the
	signal cable.			RCA cables on a different route
				away from sources of high
				current.
	Bad component in the sig-			Check connections, bypass
	nal chain.			additional components (cross-
				overs and equalizers) between
				the source unit and the ampli-
				fier. Connect one component
				at a time to determine the
				culprit. Repair or replace com-
				ponents as necessary.
	Noise is	radiating	into	Disconnect existing speakers
	speaker cables.			and connect a test speaker to
				the output terminals of the
				amplifier. If noise is gone, re-
				route the speaker cables away
				from sources of high voltage.
	Multiple grounds in		the	Check ground connections and
	audio system.			connect amplifiers, signal pro-
				cessors, and other components
				to a central location or try a
				different grounding point on
				the chassis.
	Ground loop between source			Check connections, disconnect
	unit and antenna.			antenna from source unit. If
				noise is gone, install an an-
				tenna ground loop isolator.
Engine Noise when	TOPAZ input circuitry		(in	Supply reference ground to the
using high level	Rockford amps) or floating			TOPAZ input circuit (or float-
inputs	input circuitry (in non-Rock-			ing input circuit in non-Rock-
	ford amps) does not have			ford amps). Connect shield of
	reference	to “chassis		RCA input from auxiliary amp
	ground.” This noise, if any,			to chassis ground of radio. An
	occurs at the auxiliary am-			alternative method is to con-
	plifier whose inputs are fed			nect the RCA shield to the
	from the pass-thru output of			amplifier's power ground ter-
	the first amp.			minal.

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

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