yesterday I had a chance to connect my AR and A4 MK1 to a PA speakers - so far so good.
I realized that from A4 and AR using the original power supply I will have a buzz (drone-like) sound in the background through the speakers…
the sound is also there when both units are not powered ON - so buzz through speakers is there even they are powered OFF!
disconnected AR and A4 from power circuit and using my power banks (https://www.amazon.de/XTPower®-XT-20000QC2-Powerbank-moderner-20400mAh/dp/B01M9BGFJM) and the buzz-drone is gone…
I also have tried different wall plugs and that stuff - we also have different gear connected (Digitakt, RC 505, Traktor S4) but the problem seems to be the power supplies of AR and A4 mk1.
has anyone noticed similar issues/behaviour?