I am buying a 410 soon which I will probably use both with and without my 8 ohm 210 cabinet. My head is stable down to 2 ohms, so I am leaning towards getting a 4 ohm cab so I will have the ability to run it alone and really push it with my head. On gigs where I am running both the 4 ohm and 8 ohm cabs together, there shouldn't be any problems with the weird load (2.6 ohms or something) I am running...right? Would there be an odd difference in volume between the two? Thanks.