I upgraded my PA with better JBL 1.5" drivers and had the stock ones left laying here. I got an empty JBL box and decided to fill it and make a monitor. When completed, I noticed there wasn't any upper mids coming out of the horn? I compared it to other ones and confirmed this.
I pulled out the brand new JBL 2432h driver, and removed the diaphragm. First thing I noticed was a oil substance in half of the gap. I cleaned that out and re-installed for a test. Still no mids. I removed the diaphragm again thinking I missed some of the oil. Using a cut plastic zip tie, I noticed the gap is not even. There is a tighter area where the zip tie gets stuck.
Is this driver held together with some sort of glue? Can I align the gap?
Is this a defect?