Good morning to all, Before I begin, I welcome Alan's initiative to create this forum. I am a proud owner of a P452 which has impressively increased my listening pleasure on my system ... But that's not the point! Even before being a customer at March Audio, Alan had been kind enough to answer a problem that was materializing in my house by a consistent crackling on one of my speakers. Where Topping hadn't had one which had cost me an exchange under warranty of my dx7 pro. Alan had diagnosed a ground loop problem when I plugged in my DAC which caused a compatibility problem between my different audio components. This problem should have been solved either: - by changing a device of my system (node 2i , dx7 pro, pre + amp YBA at the time 😉 ) ; - or by using XLR cable Thing done with my P452 + XLR <=> dx7 pro. But that sizzle persisted. So I took the initiative to use a schuko plug that I had, to isolate the grounding plug from the DAC with tape. . And there ... nothing more !! what a relief ... The approach of this post is twofold: - that my experience can be useful to others ... - ask a question: can this operation harm the elements of my installation? and will I reduce the sound quality of my DAC over time? Thank you for your attention and have a good end or beginning of the day !