Had something similar. Only with my monoblocks it happened with only one speaker. The culprit was a capacitor in one of the amps. It initially took hours for it to occur but over time it increased till I couldn't turn on the amp without the sound. Since you have it in both it could be the same cause but perhaps in the preamp or just bad luck to have the same cap go out in both amps, a very unlikely possibility, but still one none the less. Hope this gives you a start.
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