I'm going to be replacing some speakers in a 412sp. I haven't pulled them out yet but i think they are original. 3 work great, but 1 has a rubbing voice coil.
I also have another 412sp and all the speakers work fine. When I replace the drivers in the 1st cab and I decide on which new drivers sound best I will be getting rid of the other 4 old sunn drivers as well.
I let you know for sure what they are when I pull them out in a few days.
I also have original speakers from a beta lead 2x12 to get rid of.