Bumping this thread with information about the Astro City 2 speakers.
The cab I bought came with some nice aftermarket 4ohm/15watt speakers, whereas the AC2 takes 4ohm/40watts. The upgrade to these are amazing. Definitely the loudest and boomiest sound out of any traditional candy.
The speaker boxes are marked with the model speaker inside the box, these three are "302", the other one (not pictured) was a totally different number.
I swapped the boxes around from this set from China with the ones originally in the cab as they were rust free.
I guess it is safe (and sad) to assume that this set of speakers is rotting away from age/being on site? Or it could be dust? I didn't want to pry any further in case I started doing damage to the cone. The sound doesn't seem to be affected at this point (as compared to my Blast City speakers which are toast).
Apparently, the status quo is that these speakers are Bose, however I couldn't find any markings to suggest so, and a google search shows up empty with the model number.
One of the best things about AC2 is that it's just the red and black wire to install, no need for having to pull out the soldering iron or crimp some wires.
Hope this brief insight is helpful to someone. My AC2 is a dedicated DoDonPachi machine, now my "Power Up" comes with a lot more punch and bass.