Hey everyone, I want to biamp my second SBX cab (1X15) to my 700RBII...Can someone please confirm I only need a second 2+ 2- speakon cable to do this? I had one made locally lastnite, but it didnt work.. Im just want to make sure it is in fact a 2+ 2- that I need... I got the SBX cab in the era where no cable was supplied with the cab... Thanks!!