General information:

Basically, all speaker systems before 1986 used JBL drivers.

The big "change" came in 1986 with the Blue Box, the first "Ribbon Compact Driver-loaded" product, with more to follow.
In that same year, all woofers were/are Stage Accompany, the PPE2400 came as "digital controlled analog" PEQ system with SAnet.
The PPE2410 PEQ and PPA1200 amp where introduced in 1988.