I have a 212 closed back cab that currently has 2 vintage 30s in it. I am going to swap one out with a g12m to see if I like the tone. Will it be ok to do this with a 100w marshall dsl head? The cab would then be a 85w cab. I rarely get the volume knob up over 3 on this amp. I read somewhere that each speaker should at least be 50w to run with a 100w head in any situation, is that true? on a different note, has any one tried this v30/g12m combo? Howd it sound?