Quote Originally Posted by Little Jay
Check here: Princeton Reverb fenderguru.com. Fender amps, mods, modifications, vintage, maintenance, tubes, speakers, schematics, blackface, silverface, jens mosbergvik.

(scroll down to '12" speaker upgrade')
I was surprised to read in the link I posted above that apparently you don't even need a 12" baffle board. Here they promote that you can put a 12"speaker over the 10" hole and it will work fine... hmmm.... I would rather make a new baffle-board. It's easy enough, already did that once when I changed my Blues Deluxe from 1x12" to 2x10".