About 15 years ago I had given away my Sony CDP something UK tuned CD player and when the planned upgrade didn’t work out I borrowed one from a friend.
This was an an uber cheap Aiwa model that hadn’t seen action in years. It sounded flat and one toned, but it did the job whilst I auditioned potential upgrades on the Sony.
Anyway, I remember being shocked one day about 4 weeks later when it miraculously opened up tonally and became really engaging.
To this day I don’t know what happened. If it was the CD player, then ?
If it was me, then ??
Neural reprogramming? Wow!