Rockford Fosgate RFX8340 Installation & Operation Manual page 70

SYMPTOM
Engine Noise
DIAGNOSIS
Source unit is not
grounded properly
Noise is radiating into
RCA signal cable
Bad component in the
signal chain
Noise is radiating into
the speaker cables
Multiple grounds in
the audio system
– 68 –
REMEDY
Check connections and repair
wiring as necessary
Check connections, run the RCA
cables on a different route away
from sources of high current
Check connections, bypass addi-
tional components (crossovers
and equalizers) between the
Source unit and the amplifier.
Connect one component at a time
to determine the culprit. Repair or
replace components as necessary
Disconnect existing speakers and
connect a test speaker to the out-
put terminals or the source unit. If
noise is gone, reroute the speaker
cables away from sources of high
current
Check ground connections and
connect amplifiers, signal proces-
sors, and other components to a
central location or try a different
grounding point on the chassis