I’ve got a slight volume imbalance on my Quad 63s. One is about 2-3 db lower than the other at 1m. I’ve had them for over thirty years and have replaced the panels myself over the years. One thing to mention. There’s a little covered hole which with the cover removed at the back shows a flashing led that has something to do with charging of the panels. The quieter speaker only flashes every 17 seconds whereas the louder one flashes every two seconds? Is this a clue to what may be the issue?
Welcome Borosteve. This would be a question for this subforum - https://www.diyaudio.com/community/forums/planars-exotics.54/
