Anyone do this? My smallish rig is an SVT-II with a 4 ohm 2X10 cab. Thinking of adding a 15 cab, but the one I'm looking at is 8 ohms. That SVT head works with 2 or 4 ohms, and has 2 speaker input jacks. Wondering if the combination of a 4 and 8 ohm cab will cause issues at moderate classic rock volumes (I have PA support).