Congratulations!
Nice find! These are rarer than the J Modulars, it seems. The Premiere line ran through the P22 model, so your units are among the later models. The Premiere line began as a consequence of two factors: Fulton wanted more power, more "umph" than he was getting with the J Modulars, and many of the drivers he used in the Js, such as the Rola Alnico 8" and Peerless Alnico tweeters (in the 80s) were discontinued. Also, the fabulous RTR electrostatic super tweeters that he modified for the Js were discontinued. The Premier line is the replacement line of large speakers, with the same outward appearance and dimensions as the J Modulars. He used an odd assortment of drivers including the EV T-35 (Klipsch K77) horn tweeter. By endless experimentation with the crossovers and driver orientation he was able to make a system that speaks with one voice, even though it is a 9-way system.
I've never owned them myself, having "only" owned the J Modulars. But Jeff Medwin on this site ("dowto1000") has had more experience with them. I have heard P20s at a friend's house rather extensively. I admire the power and punch, but I still prefer the top octaves of the J Modular (I'm not sure my friend agrees). This prompted an experiment: We placed the mid (FMI-80) and tweeter (FMI-6/RTR ESR-6) from the J Modulars on top of a Premier bass cabinet. I thought the results were the best I'd heard from any Fulton speaker. My friend is more cautious about the conclusion. Anyway, enjoy what you have. VAC amps ought to work well with them.
PS: Fulton would have approved of your Crown tape decks.