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©2008 Dual Electronics Corp.
NSA0208-V02
XPA SERIES
OPERATION
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
green (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
Speaker load less than 2 ohms
Adjust speaker load - amplifier will not
operate at less than 2 ohms
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)
XPA2100
XPA4100
XPA6100
