Got a 1973 jbl l26 box, mounted a good woofer I had around and it sounds awesome (still searching the tweeter). Amp is vintage as well, 1972 rota OTL-2200 : r/audiophile
1983 B380-B460
AC/AC Adapter For Vintage JBL B460 Subwoofer Speaker & BX63 BX63A Dividing Power | eBay
1983 B380-B460
B460 Subwoofer information - Page 2
Transport a JBL B460 - 18 Passive Subwoofer to Saint Paul | uShip