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I had the same amp! It is the JL 300/4 and one of the chanels came in really fuzzy. It sounded as if the the wires were touching during my installation. I called JL and a JL authorized dealer it would have costed me 190 dollars total to get the amp fixed. Instead I opened up the amp to see if anything looked out of the ordinary. When you open the amp, see if the green fuse looking things are aligned. If they are not aligned then straighten them out. I think they had gotten out of place from being dropped becaue I baught my amp used. My amp works perfectly now!
This is no joke man, I did this just yesterday and was really excited to save 190 bucks. I'm not a technical guy or anything all I know is the green things are located behind the out puts inside the amp.
If the low impedance light is coming on, you may have shorted wiring or a defective speaker. Disconnect all of the speaker wires from the amp. If the light does not come on, reconnect one speaker at a time to see if you can find the one causing the problem. If the first one you connect causes the problem try a second one.
If the light comes on with no speakers connected to the amplifier, the amplifier is in need of repair.