hey guys, have been using a quad into my marshall jcm800 50w 2x12 combo with good results. now i have a 4x12 and have too many boxes to carry around! So i want to sell my 800 combo but wondering on which poweramp to buy with the cash. for size and weight i would like a mesa 20/20 but not sure if it will be loud enough. my 50w marshall is plenty loud and i play medium rooms in a loud rock band. will the 20/20 do the job? also can i join the 2 channels to make 40w or something? ta!