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For any system to operate at minimum distortion with minimum noise and still
reach full power output, the equipment should all be aligned to operate at the
same point on the curve at the same time.
In a basic system, using a single amplifier, set the amp gain to minimum, turn the
deck up until it just starts to distort, then back the deck down slightly. This is the
point where the output of the deck is cleanest. Now, bring the gain of the amp up
until it just starts to distort, and back it down slightly. This will allow the deck and
amp to reach maximum useable output at the same time.
SYSTEM FINE TUNING
Now that the gain controls have been properly set, the system is ready to be "fine
tuned". Always tune a multi-amp/driver system from the bass up. In a bi-amp
system, the subwoofer crossover should be varied until the smoothest low
frequency response has been obtained. Tri-amping is a more sophisticated
process of sound reproduction and hence requires more time to properly design
and fine tune. Keep in mind that a poorly designed tri-amplified sound system
may yield lower sound quality than a well executed bi-amped system.
NOISE NOTES
Unwanted noise is the worst single problem encountered in automotive amplifier
installations. Several basics must be kept in mind when preventing noise
problems.
1. Use shielded cables whenever a preamp level music source is used.
2. All connections must be tight and free from corrosion, paint, etc., and
insulated.
3. Route all signal cables away from existing wiring in the vehicle.
4. If possible, avoid mounting the amplifier in the dash or on the firewall, as noise
may be induced due to the proximity of noisy wiring and switches.
GENERAL TROUBLESHOOTING
NO SOUND
Check all connections. Check main power fuse. Check accessory fuse. With a
trouble light or meter, be sure +12V is present at the amplifier on the large
positive cable and on the small red/white turn-on wire. Check for a good ground
connection. Check by substitution or other method for proper operation of music
source.
BLOWS FUSES
Check all connections to be sure all power wires and speaker wires do not touch
ground or each other. Re-check polarity of main power wires.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
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LINEAR POWER™ is a trademark of Linear Power, Inc
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