I searched this question but couldn't find a clear answer. I have my Mesa M-2000 and it only can handle a 4-Ohm load. Occasionally I like to hook up my "big rig" which ends up with two 2Ohm loads (perfect for my QSC 3402). Now can I be safe just using my M-2000 as a pre-amp, without any speakers plugged directly into it? Or do I have to bring along something to match the impedance. I know this is true for tube amps, but what about SS.