| That's not uncommon. A lot of manufacturers have drivers special built to their own specs. Fender used to put the special design label on off the shelf Jensens and Utahs. Gallien-Krueger makes all of their own drivers, many have Eminence build for them or a few other speaker makers. The JBL will need to match up to the cabinets interior volume (size). If the cab comes close to it's needs it should sound really good, if they don't match up it could sound really bad.
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