OK, setup my HomePod in a certain location and got everything working perfectly......had it in the same spot for a few days. I wanted to try another spot in the room, so I unplugged it and tried another spot....didn't like it and moved it back to the same exact spot. Volume level the same as verified by asking Siri Same exact song playing from my iCloud music library. Music is now significantly louder than before at the exact same volume level. What the hey? It must of recalibrated differently? I like the HomePod even better now.......sounds even better to me than before.