Premire JBL general public have used a titanium tweeter.
Filtration of this model changed radically with the old productions, not by its technical quality, but we got an acoustic made more neutral, with a high mdium a little less forward.
My advice is to stiffen the entire body by a bonding of quarter round of the indoor one.
The enclosure does not vibrate at all, the bass is dbarrass returns interference by bad vibrations contained no such change.
Serge.