I've got some Bassman cabs. A 410h rated at 300W cont and 600 pk. and a 115 rated at 150W cont. and 300 pk. The 700RB is 480W..Wondered how close to 12 o'clock I can get on the master w/o worrying about blowing up the 15...How much power are each of these cabs getting when they're both hooked up?