HifiDJ and I have a similar situation with the Allnic HPA-3000 GT where it has a very low-level buzz only on the high-impedance output and only with specific headphone manufacturers (ZMF, Focal). I picked up an older model Power Plant (confusingly also called the P3, lol), and yeah, I can confirm that the buzz is still there with my Power Plant in place. (Though I also didn’t buy it for that reason.)
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