Distortion in tweeter from amp issue

[therealjroc 10+ year member]

Ok so I have a JL 360/4 amplifier. My rear right speaker tweeter started distorting, like a staticy noise at certain frequencies. So i figured it was a blown speaker since they were getting old. Replaced the speaker, same problem.

So i swapped the rca's around on the input side of the amp, and every rca still made the noise on that channel. So Hu is good, and rca's are good. Then I swapped the outputs around to the speakers from the amp and that tweeter sounds perfect on a different channel, other speakers sound bad on that channel as well.

With all that said it looks like an issue with the amp to me. Any ideas what I should be looking for when I pop it open? Any info would be awesome! Thanks.

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