I currently own a Trace Elliot stack with a 2x15"s cabinet. Wich sounds awesome and almost to perfection to my taste. But since our band get to play bigger gigs on bigger stages, I'm gonna buy another cab (or maybe even with another head). I don't know if I should get a 4x12" cabinet or just get another 2x15" Trace Elliot. What would an 4x12" cabinet do to my sound ? I play (try to play) progressive metal, I only use my fingers, use only clean and distortion, like to detune my 4-string into DADG, and solo alot.