Only 6 on the series ship...
Message:Per a number of subsidiary sources, the ship in the show has 6 phasers, in 3 banks of two...
Bank 1: forward ventral
Bank 2: Port Dorsal
Bank 3: Starboard Dorsal.
Much of the movie subsidiary material makes it clear that it's still 3 banks... but each bank is now 4 emitters for 2 phasers... each weapon having two emitters, one dorsal and one ventral... some add a 4th ventral bank under the secondary. (Many will point to this as an SFB influence... but it's probably just convergence).
Note that the TOS movies were post refit, and the refit explicitly has phased improvements mentioned in the motionless picture.
Yours,
AramisErak
26-Oct-2021