Bose QC 35 V1 headphones when charging and used passively connected via the headphone jack to an iPad or iPhone also being charged from the same source would pi

Bose QC 35 V1 headphones when charging and used passively connected via the headphone jack to an iPad or iPhone also being charged from the same source would pickup audible digital bus noise of the iDevice. Moving the charging sources to different ground planes would solve the problem. It would also happen if devices were being charged by different power adapters connected to the same neutral or ground. This led me to conclude it was a form of ground loop due to a lack of engineering and testing of the headphones.