NOISE TROUBLESHOOTING PROCEDURES
1. Start engine and let idle.
2. Turn system on. ADJUST INPUT GAIN ON AMP SO THAT IT IS TURNED
DOWN AS FAR AS POSSIBLE TO STILL PRODUCE ADEQUATE LISTENING
LEVELS.
3. Slowly increase and decrease engine speed.
4. Take note as to the type and amount of noise while slowly varying the volume
control on the music source from minimum to average levels.
5. If noise is a popping or ticking sound, increasing in speed with engine speed,
the source is probably the ignition system. If the noise is a "whistle," the source is
the alternator. If the noise is present only when the volume is turned up, both
types of noise require similar treatments.
6. Unplug the inputs to the amplifier at the amp. Again, listen to the amount of
noise. If the noise disappears, install a noise kit (which can be purchased at any
Radio Shack or other electronic outlet.) (See note A)
7. If the noise remains when the inputs are removed, re-route the power
connections and check for the proper ground connections (see note B).
NOTES
A. Install a noise kit in the main power to the music source. If the music source
has a dimmer lead, install a noise kit there also. Check all grounding points for
corrosion, paint, ECT. Scrape clean, and retighten if necessary. If noise
continues to persist, refer to note C.
B. Reroute the main power ground to a different location in the vehicle. Listen
carefully to the amount of engine noise through the system each time the ground
is changed. If relocation of the power ground has little or no effect, obtain a high
current choke (coil) with a current rating of at least one and one half times the
maximum current rating of the amplifier and splice inline with amp main power
wire. IMPORTANT: SOLDER AND INSULATE ALL CONNECTIONS. If the
noise still persists mount the amp in a different location farther away from the
engine compartment. Be sure all main power wires to the amp are routed away
from existing wiring in the vehicle.
C. Touch the center pin of the music source male plug to the center hole of the
amplifier female jack so that the music is heard. Prevent the outer ground contact
from touching the female jack on amp. If this procedure causes noise to
disappear modify the input cables by carefully removing 1-2 of the outer
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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