I'm not 100% sure I understand what you are trying to do here? But because you used the word `Thingy' This scares me into thinking you will mess something up. If it's a EXT. Speaker out? It can only go to a speaker. You cannot put this into another amp.Liquid said:Ok so i gots a peavey valve king and i want to hook a bass amp into the extention cab thingy. So would this like mess up the amp or the cab? I know the tone wont be as great but im not a nut when it comes to my bass tone.