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Internal crossover not set properly
for speakers
Readjust crossovers. Refer to the Internal Crossover section of this
manual for detailed instructions.
Speakers are blown
Check system with known working speakers and fix or replace as
needed.
Poor bass response
Speakers wired with wrong polarity
causing cancellation at low frequency
Check speaker polarity and fix as needed.
Crossover set incorrectly
Reset crossovers. Refer to the Internal Crossover Configuration section of
this manual for detailed instructions.
Impedance load at amplifier is too low
Check speaker impedance load, if below .5 Ohms stereo or 1 Ohms
mono rewire speakers to achieve a higher impedance.
Battery fuse
blowing
Short in power wire or incorrect wiring
Check power and ground connections and replace or repair as needed.
Fuse used is smaller than recommended
Replace with proper fuse size.
Too much current being drawn
Check speaker Impedance load. If below .5 Ohms stereo or 1 Ohms
mono rewire speakers to achieve a higher impedance. Check power and
ground connections and replace or repair as needed.
Amplifier fuse
Too much current being drawn
Check speaker impedance load. If below .5 Ohms stereo or 1 Ohms
mono, rewire speakers to achieve a higher impedance and replace with
recommended size fuse.
Check power and ground connections and fix or repair as needed.
Fuse used is smaller than recommended
Replace with proper fuse size.
Impedance load at amplifier too low
Check speaker impedance load. If below .50 stereo or 10 mono, rewire
speakers to achieve a higher impedance.
Speaker is blown with shorted outputs
Check system with known working speakers and fix or replace as needed
AUTOSOUND 2000 TROUBLESHOOTING TIPS
QUICK
CHECK
FOR
TROUBLESHOOTING
CAR
AUDIO
SVSTEMS
Preface:
All audio systems exhibit noise; however, if the level of noise is low enough, and the signal level high enough, noise should not be a prob-
em. This means that it is very important that the signal level throughout the system be optimized BEFORE dealing with your noise prob¬
lem. Using a scope (or a small portable amplifier) and Track 99 (1kHz at all high bits) of Autosound 2000^s CD #101, or tracks 24 through 29
of Autosound 2000's CD #102, adjust the system so that when the maximum usable signal level of the deck is fed into the system, all the
preamp level components clip at the same time. However, we recommend up to as much as a 3:1 voltage overlap with the power amplifiers*
i.e. an amplifier with a 2 volt minimum sensitivity can be driven by up to 6 volts of signal.
Noise Overview:
Car audio electrical accessories are notorious for interfering with car audio systems. The interference commonly arises from three areas:
1)
Power line noise (5%), which can be attenuated with in-line noise filters,
2)
Inadequate power supply isolation (45%), which can be cured with transformer signal coupling, additional isolated power
supplies, or changing out components, or
3)
Inductive interference (45%) - Including loop area inductive noise picked up by the signal cables - which can be remedied
by relocating or rewiring components, rerouting signal cables, or using twisted cable or balanced transmission systems.
AUTOSOUND
2000
1-2-3
METHOD
OF
LOGICAL
TROUBLESHOOTING
I.
MUTE THE AMP(S). Insert a muting plug (shorted male RCA connector) into each amplifier channel. Turn up the amp sensitivity. Start
the car and turn on the headlights, air conditioning, brake lights, etc. Listen for noise in each speaker. Be very picky here!
A.
If still noisy, substitute a small test speaker with short leads for the speakers, crossovers, and speaker leads in the car. If still noisy,
substitute an isolated power supply (120 VAC to 13.8 VDC bench supply or a small motorcycle battery) for the caCs alternator If the
amphfier is noisy with the test speaker, you have a BAD amp. Send it in. It really doesn't matter if it is quiet or noisy while running
on the isolated supply because you have a BAD amp. Send it in for repair and if it was quiet on the isolated supply, indicate so on
page 43
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