I found this “An Overview of Audio System Grounding & Interfacing” PDF in my computer from 2012. A great presentation by Mr. Bill Whitlock (Jensen Transformers). When I was a student, it was the earliest days of internet (25.6kbps modern era…er…er..duu…) . I still remember reading all these emails exchanges from Mr. Neil Muncy and other professional engineers. It opens a whole new world to me that I able to learn from the knowledgable people with accurate information. This is a very good, easy to understand and gets quite in depth presentation for anyone who is obsessed by audio system interfacing. These great info are came from the AES (Audio Engineering Society) which I recommend all of you to join. If you have difficulty or need any help to join AES, feel free to contact me.