First of all, I want to say that this is a nice forum - internet put to good use...
So, I have a Sunn Concert Bass head from 1972. I am going to have to choose between an early 70's Ampeg 810 fridge cabinet and a mid 80's Ampeg 8x10 cab. Maybe this question would do better in an Ampeg forum, but those guys don't know Sunn like you do, so...which of these cabs would be louder with my head? I should probably upgrade to a Coliseum...I know.