Hi JBL Maniacs!

Again I have to come with a problem

Today my second 2416H arrived

I connected it to the 4425 X-over (rebuild) and did realize that it has much lower output than my other 2416H. What to do?

I first cleaned the mash on the throat and as this didn't help I removed the back cover to see that everything looks like beeing ok.

While reinstalling the back cover I learnd that it is not self centering and the sound quality differs when moved slightly.
It doesen't matter how I adjust the back cover the output is still lower than that from the other one.

What the h... I can do or what can be wrong?

Any idea?

Thanks for help