9
Problem
Cause
Action
Unit will not turn on
(no power LED indicator)
BAT+wirenotconnectedorincorrectvoltage
REMwirenotconnectedorincorrectvoltage
Checkconnectionsforpropervoltage
(11~16VDC)
GND wire not connected
Checkconnectiontoground
Fuse(s)blown
Replacefuse(s)
Unit has power - LED is
green (but no sound)
Volume turned all the way down
Increasevolumelevelatheadunit
Speakerdefectiveordamaged
Check/replacespeaker
Input signal not connected
Checkhighorlowlevelinputsfor
proper connection
Unit blows fuse(s)
Incorrect fuse rating
Usefuse(s)withcorrectrating
BAT+ wire touching chassis ground
Checkforpinchedwire
Speakerdefectiveordamaged
Check/replacespeaker
Engine noise
Bad ground connection
Makesureamplifierisgroundedto
clean bare metal
SignalgroundlooporRFI(radiofrequency
interference)
Re-routeRCAcablesfromexisting
high current wiring
Distorted audio output
Incorrect input signal type or
inputleveltoohigh
Checkconnectionsandreduce/adjust
inputlevel
Low audio output
Incorrect input signal type or
inputleveltoolow
Checkconnectionsandincreaseor
adjustinputlevel
Weak bass
Lowfrequencyoutputisoutofphase
Adjust phase control as needed
Troubleshooting
OPERATION
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providethisreceiptintheeventyourequireservice,asyour
original receipt is considered the best proof of purchase and
indicates the date you purchased your Dual product.
Dealer Name
Dealer Phone
Purchase Date
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Registration
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