Rockford Fosgate 125.2 Operation & Installation page 31

Symptom
Engine Noise
• If noise persists, see your Authorized Rockford Fosgate Dealer.
Diagnosis
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.
– 28 –
Remedy
Check connections, run the
RCA cables on a different route
away from sources of high
current.
Check connections, bypass
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.
Disconnect existing speakers
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.
Check ground connections and
connect amplifiers, signal pro-
cessors, and other components
to a central location or try a
different grounding point on
the chassis.
Check connections, disconnect
antenna from source unit. If
noise is gone, install an an-
tenna ground loop isolator.
TROUBLE-S
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