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Noise is radiating into
RCA signal cable.
Bad component in the sig-
nal chain.
Noise is radiating into
speaker cables.
Multiple grounds in the
audio system.
Ground loop between
source unit and antenna.
Engine Noise
Symptom Diagnosis Remedy
Check connections, run the
RCA cables on a different
route away from sources of
high voltage.
Check connections, bypass
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.
Disconnect existing speak-
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.
Check ground connections
and connect amplifiers, sig-
nal processors, and other
components to a central
location or try a different
grounding point on the
chassis.
Check connections, dis-
connect antenna from
source unit. If noise is gone,
install an antenna ground
loop isolator.
• If noise persists, see your Authorized Rockford Fosgate Dealer.