I have an old 15"inch dietz cab that's solid as a rock loaded with some crappy replacement. I'm currently running a 2003 mij Geddy lee jbass through a markbass 12inch combo>12" ny traveler cab. My concern is that I want a much fatter 'vintage' jbass/pbass tone with more low end. So should I: 1) reload the old dietz 15" cab with something fat like a Mesa and run that with the mark bass combo (any suggestions here on loading that dietz would be great!!) 2) and austere pre amp to fatten up the tone/options on my bass 3) do both???