Its been a while since ive last posted here, but here goes. I have a Mesa 400 (runs at 4 and 8 ohms) playing through an ampeg 4x10 (4 ohm). I want to add a 15 for bigger gigs, but something tells me that running an 8 ohm 15" and a 4 ohm 4x10 wont be very good for my gear, or work very well. Im no expert with wiring and electronics, but by scanning through the "Why would anyone buy a 4 ohm cab?" thread i noticed someone saying via switches and wiring people can split the load. I guess the question is, is it possible for me to add an 8 ohm something to my rig? Another thought ive been having is to sell my 4x10 and get some money for some used EA speakers. Would i be better off checking something else out for more power? Thanks for the help.