hey i was just wondering...is it possible to re wire my combo so that the speaker gets connected to a line 6 pod xt rather than the amp?
Yeah, but you won't have a poweramp in there and you probably won't be able to hear it.
I dont exactly get what do you want to achieve here... Connecting the speaker directly to the POD will result in... well, nothing. The POD is not an amp and it is not capable of driving a speaker.