Freddie, that's what I thought before I spoke with my longtime (30 years) Mac friend. We had about a half hour conversation and among other things discussed this issue. He is an engineer very high up in Mac. He feels the problem could be with your power conditioner and thinks you should plug the 1502 directly into the wall outlet. He also mentioned a weak tube or poor connection between the 1502 and the speaker.
Best
Charles
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