Good clarification and I should have been more clear. The noise is loud, no matter how I try to lower the volume, it’s a constant ~ 90+ decibels, mid frequency and constant until
I shut off the speaker and/or zone. I have several Meridian zones and I believe I am familiar with the ever so slight ‘white noise’ hum from Meridian DSP’s. I was able to solve that in separate zones and with different Meridian speakers 100% with isolation transformers (i.e. Furman), but this is different and I will keep this group informed as to what the root cause was for this noise, and how it goes post remediation. It will take a few weeks possibly longer. I will say that having used these speakers extensively for ~ 10 years with zero issues until now, is very impressive these speakers have been terrific.

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