Simple solution is to mic the amp with the tone you want. :wink: I would set the gain to where you want, the get the master on 10 o'clock, and use the output to get it loud. The bass set low, and letting the bass player cover that turf works best for guitar amps in general. Not anemic on lows, just not trying to cover the bass and guitar riff. Up loud you may find you can dial back the gain 15% or so from what you had it set at for lower volumes. As previously stated, more power gives more clean power headroom to amplify the preamp distortion signal, before driving the power amp in distortion. Triple Rec is obviously more power. But you also have to BLAST it to get a bit of power amp distortion. Double edged sword there.
IF you can, bringing your Single Rec to a music store, and doing an A/B/C with duals and triples thru the same cabinet will answer all your questions.
I have been wanting a new 4x12 for a while. In a few months I will bring my two main heads to a very accomodating music store and test 5 or 6 cabs. Seems to be the only way
for me to separate internet hype from 'fact' as my ears percieve it.
Good luck with your tone quest.