I've got a Crate VC 20 combo and I'd like to put the chassis into a head. coming out of the back of the chassis with the pos/neg for the speaker is a brown wire. The brown runs back to the transformer. I'm not sure where the brown actually terminates...but it goes in that direction! On the front of the chassis is a 1/4" speaker out. SO, i'm thinking maybe the red/black can be tied off and the 1/4" on the front can be used for a speaker cab. However, I'm fairly clueless about electronics and I don't want to die just yet. Is the brown wire a ground? It doesn't seem to have anything to do with the speaker but it is coming out of the same hole as the speaker wires. I looked for a manual online but could not find one...can anyone shine some light on this? thanks!