Several years ago, I got a set of wireless earphones with an Apple purchase. After some experimentation with the different sized cups, I got them tuned to my ear and loved them.
Then, I lost them. So I ponied up the money and ordered a new set, but the cones were … different. They didn’t fit as well, it didn’t sound as rich. Maybe there were other changes.
Today, I found them. Ihave no idea how they ended up where they did, but the originals are back.
Now I have a backup … which don’t sound as good.