For my 8K’s I eliminated the hum/noise with an isolation transformer.
For my 3200’s, each speaker is plugged into a Furman wall socket plug, that
also has worked quite well to reduce hum/noise. Repair Shop did a great job
fixing my 3200’s, they have been operating without issue since repair.

861v8 || 818v3, UHD722, Oppo 105D, DSP8KSE L/R, DSP7200HCSE, DSP5K Rears, DSW, Kaleidescape Cinema One [x2], Roku4K, Apple TV || DSP6K - 2 channel, HD621 || Roon Core / QNAP TVS-872XT || 218 || MacIntosh CS200 || MacIntosh MI128 || DSP3200 L/R