Yamaha drivers, horns & kits

Yes - Yamaha did produce a full line of drivers, horns and filter kits.
Onkyo did, too, Technics did, too, but as we all know, mostly JBL sold any :)
But there was a time one could purchase the Be drivers and compression horns to make DIY NS-1000s or FX-1s - gone-by days.

The image above comes from a japanese 1981 catalog ; it shows only part of Yamaha's drivers lineup, unfortunately with no specs. This lineup also omits the old JA-6002 and JA-5002 which, by 1979, were prehistoric history although they seem to have been produced until the mid 1980s, notable for some Japan-only B.E.S. loudspeakers.