Appendix D: Troubleshooting - JL Audio m600 Owner's Manual

APPENDIX D: TROUBLESHOOTING

"How do I properly set the input sensitivity on my amplifier?"
"My amplifier doesn't turn on."
"I hear a repetitive ticking or popping sound coming out of the speaker(s)."
"My amplifier's output fluctuates when I tap on it or hit a bump."
16 | JL Audio - M600/6-24V Owner's Manual
Please refer to Appendix A (page 14) to set the input sensitivity for
maximum, low-distortion output.
Check the fuse or circuit breaker, not just visually, but with a
continuity meter. It is possible for a fuse/circuit breaker to
have poor internal connections that cannot be found by
visual inspection. It is best to take a fuse out of the holder
for testing. If no problem is found with the fuse, inspect the
fuse-holder.
Check the integrity of the connections made to each of the
"+24VDC", "Ground", and "Remote" terminals. Ensure
that no wire insulation is pinched by the terminal set screw
and that each connection is tight.
Check to make sure there is +12V to +24V at the "Remote" connection
of the amplifier. In some cases, the turn-on lead from the
source unit is insufficient to turn on multiple devices and the
use of a relay is required. To test for this problem, jump the
"+24VDC" wire to the "Remote" terminal to see if the amplifier
turns on.
Check the speaker wires for a possible short, either between
the positive and negative leads or between either
speaker lead and the vehicle/vessel's electrical ground.
If a short is present, you will experience distorted and/
or attenuated output. The "Status LED" will turn
Amber (yellow) in this situation. It may be helpful to
disconnect the speaker wires from the amplifier and use
a different set of wires connected to a test speaker.
Check the nominal load impedance to verify that each channel
of the amplifier is driving a load equal to or greater than
2 ohms in stereo mode (4 ohms bridged).
Check the connections to the amplifier. Make sure that the
insulation for all wires has been stripped back far enough to
allow a good contact area inside the terminal block.
Check the input connectors to ensure that they all are making good
contact with the input jacks on the amplifier.