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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.
No reference ground
Engine Noise
Symptom Diagnosis Remedy
Check connections, and
run the RCA cables on a
different route away from
sources of high current.
Check connections, and by-
pass additional components
(crossovers and equalizers)
between the source unit and
the amplifier. Connect one
component at a time to de-
termine the culprit. Repair
or replace components 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 and
disconnect antenna from
source unit. If noise is gone,
install an antenna ground
loop isolator.
Connect GND terminal of
high level input to chassis
of source unit.
• If noise persists, see your Authorized Rockford Fosgate Dealer.
TROUBLE-
S
H
O
O
T
I
N
G
Engine noise with
high level inputs