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As I have started discussing here I have replaced my main audio system and have been upgrading it over time. My first post about AC systems seems to have started a bit of a firestorm here and I was unsure if I would even continue writing here. So with a bit of trepidation here goes! Just over a year ago I had an experience that led me to do a lot more research on AC power. --------- One Sunday evening in November 0f 2016 I was working at my computer in my basement office and my son was playing a game on his computer when we heard this rather pronounced 60 cycle buzzing sound. That is NOT good! The circuit breaker on the furnace circuit was buzzing madly when the furnace kicked into high fan. You could feel the panel as well as hear the breaker buzzing, ouch! So rocking the breaker a bit the buzzing diminished. But it took a trained person to actually fix the problem. Over time the wiring in the circuit panel had some loose connections. Seventeen breakers needed tightening and five neutral lines needed the same treatment including two that were physically loose. I have been told that this is a common issue with electrical panels due to vibration being induced in the wiring. I have no evidence to prove that this is a general problem just my one instance. A couple of days later I went to listen to the system to start evaluating a possible cable change… The system sound had changed. I listen to a group of about 25 tracks as a sort of baseline before I change something. It takes me a while to make sure things are in my mind. The world had flipped, the sound was better on the “before” test! After about two hours of listening there was more detail a bit more bass and some stage improvements. The change was noticeable but not earthshaking. I had changed nothing and the system sound changed, WAIT we did change something; one of the loose wires was on the living room circuit where the stereo is. At this time the system was setup with the Mac Mini running Roon, an ARCAM rDAC, the Rotel gear and a pair of B&W Matrix 805 speakers. There was an older power conditioner on the system and all bog standard IEC power cabling. This is mostly a wake up call for us to check our home electrical systems for safety. I am pretty sure that this problem was responsible for some issues with a couple of GFCI devices in my home opening up sort of randomly. I caution against this being a DIY project. The AC panel is not something to work with lightly. Seek professional help if you think there are issues! --Bob