
APX280M APX490M manual.qxd 2/6/2008 11:38 AM Page 18
English
APX290M/APX490M Power System Amplifier
Pro blem
Distorted audio.
Solution
Gain is not set properly, or damaged speaker cones. Review Setting Gain; inspect each speaker cone for signs of damage (i.e. frozen cone, burning smell, etc.)
Problem
Audio lacks punch.
Solution
Speakers wired incorrectly, which causes cancellation of bass frequencies. Check polarity of wires from amplifier to each speaker as defined by the system design.
Problem
Amplifier fuse keeps blowing.
Solution
Incorrect wiring or short circuit. Review Installation and check all wiring connections.
Problem
Whining or ticking noise in the audio with engine on.
Solution
Amplifier is picking up alternator noise or radiated noise. Turn down input gain; move audio cables away from power wires. Check power and ground connections on amplifier; install an
PRODUCT SPECS
MODEL
Frequency Response Signal Noise Ratio
THD
Input Sensitivity Low Level Input Sensitivity Speaker Level Max. Power Output Cont. Power Output
at output @ max power
APX490M 20Hz ~ 20kHz >97db
.10% all channels driven
200mV ~ 6.0V
500mV ~ 13V
720W (180 x4)
360W (90W x4) @.10% THD
165W x 4 @ .10% THD
330W x 2 @ .10% THD
58A @ 720 Watts
APX290M 20Hz ~ 20kHz >95db
.10% all channels driven
200mV ~ 6.0V
500mV ~ 13V
360W (180 x2)
180W (90W x2) @.10% THD
150W x 2 @ .10% THD
250W x 1 @ .10% THD
29A @ 382 Watts
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