Dual XPR520 - Specifications; Troubleshooting; Power Output; Frequency Response

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Specifications
CEA-2006PowerStandardSpecifications
(reference: 14.4VDC, 20Hz~20kHz)
PowerOutput(14.4VDC,20Hz~20kHz):
50 Watts RMS x 2 channels @ 4 ohms and ≤ 1% THD+N
75 Watts RMS x 2 channels @ 2 ohms and ≤ 1% THD+N
150 Watts RMS x 1 channel @ 4 ohms (bridged) and ≤ 1% THD+N
Total dynamic power: 400 Watts @ 4 ohms
Signal to noise ratio: 75dBA (reference: 1 watt into 4 ohms)
Frequency response: 20Hz ~ 20kHz (-3dB)
Amplifier dimensions: 2.78" (H) x 9.09" (W) x 10.56" (D)
Troubleshooting
Problem Cause Action
Unit will not turn on
(no power LED indicator)
+12Vwirenotconnectedorincorrectvoltage
REMwirenotconnectedorincorrectvoltage
Checkconnectionsforpropervoltage
(11~16VDC)
GNDwirenotconnected Checkconnectiontoground
Fuse(s)blown Replacefuse(s)
Unit has power - LED is
blue (but no sound)
Speakerwiresnotconnected Checkconnectionsatspeakers
Volumeturnedallthewaydown Increasevolumelevelatheadunit
Oneormorespeakerwirestouchingeach
other or touching chassis ground
Insulateallbarespeakerwiresfromeach
other and chassis ground
Speaker(s)defectiveordamaged Check/replacespeaker(s)
Inputsignalnotconnected
Checkhighorlowlevelinputsforproper
connection
Unit blows fuse(s)
Incorrectfuserating Usefuse(s)withcorrectrating
+12Vwiretouchingchassisground Checkforpinchedwire
Speaker(s)defectiveordamaged Check/replacespeaker(s)
Engine noise
Bad ground connection
Makesureamplifierisgroundedtoclean
bare metal
SignalgroundlooporRFI(radiofrequency
interference)
Re-routeRCAcablesfromexistinghigh
currentwiring
LED illuminates red
(protect mode)
Oneormorespeakerwirestouchingeach
other or touching chassis ground
Insulateallbarespeakerwiresfromeach
other and chassis ground
Speaker(s)defectiveor
damagedinternally(shorted)
Check/replacespeaker(s)
Speakerloadlessthan2ohms(stereo)
Speakerloadlessthan4ohms(bridged)
Adjustspeakerload-amplifierwillnot
operateatlessthan4ohmswhenbridged
Distorted audio output
Incorrectinputsignaltypeor
inputleveltoohigh
Checkconnectionsandreduce/adjustinput
level
Low audio output
Incorrectinputsignaltypeor
inputleveltoolow
Checkconnectionsandincrease/adjust
inputlevel
Weak bass
Speaker(s)arewiredoutofphase
Check(+)and(-)speakerconnections
(Observecorrectpolarity)
XPR520