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Black 15's noise

I have a set of the Alto black series 15's, which have been great for the most part. In recent months however, there has been significant noises from them when you first turn them on. Started with one and now both do it. Even with the cables unplugged the noises are still loud and consistent until they warm up. Used to take about 10 minutes for the noises to go away and now it can take 45 minutes or longer. Its difficult to verbalize the noises but it's a loud hissing with a squealing sound and some buzzing mixed in. I have tried different electrical cords, ground lift, outlets, and locations but the noises are the same regardless.

I'm looking for some guidance as to what I should check it if there is a know repair or issue to look for.

Any help would be appreciated
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