switch from the clean power source.
Problem
Engine Noise (Whine)
Solution
1.Disconnect the speakers from the amplifier. Connect a test speaker to the amplifier output terminals. If the noise goes away, check your speaker leads, speakers and crossovers.
2.Use a "shorting plug" to mute the input signal at the amplifier. If the noise goes away:
a.Bypass all of the other equipment (i.e., crossovers and equalizers) and connect the head unit directly to the amp. If the noise disappears, reconnect the equipment, being sure to test for noise after each install. Logic indicates that the last unit installed is the culprit. Refer to the unit's owner's manual for more information.
b.Connect a new RCA line from the head unit to the amplifier. If there is no noise, replace the RCA cable.
c.Run the RCA cable on a different route.
d.Run a new RCA line from your head unit so there is only one grounding point. If the noise disappears, install the radio, using only one (1) grounding point. Isolate the radio chassis from the grounding on the dash, and use an antenna grounding loop isolator on the antenna.
If noise persists, see your Authorized Rockford Fosgate Dealer.
23