Weird volume problem

[Superspirit]

I have a 19gt 300a that I put an alpine upgrade kit in along with a dsp and Rockford fosgate speakers, and a 4 to 8 in screen conversion and set the factory eq with forscan. It has been great for 4 years. Now I'm intermittently get extremely high volume from the right rear speaker. It will just get super loud for a mile or two then go back to normal. Not really sure where to start looking. It's very intermittent and I haven't found a easy way to duplicate the problem. Anybody have an idea where to start?

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[StangTime]

Can you switch the inputs on the amp input side, from R to L to see if the problem moves to the left side?

 

[Superspirit]

I can but it would require removal of the acm to access the dsp and switch the rca connection. The wiring at the amp under the dash is a an integrated harness assy from alpine. Would have to cut wires there.

 

[StangTime]

Ok so that won't be easy. This would have isolated the problem. It could likely be a bad input stage inside the amp.

 

[Superspirit]

Ya not easy to get to. And it's so sporadic that it would have to put back together and driven for several days. To see if it moves.

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