I've had the very lucky experience of playing and owning some of the best bass guitar cabinets that the world has to offer. I've had the experience of mixing cabs, using identical cabs, and using just one cabinet. I've even been able to play with 4 huge cabs at once using my QSC Power amp. For many years I used mixed cabs, a 4x10 + 1x15, 2x10 + a 1x15 too. Ultimately I found I never paid attention to how the entire rig was operating and realized that working with extra cabinets didn't add much. Using a pair of identical cabs was a bit better, but still don't care for it. I did prefer stacking cabs as oppose to side by side. I really enjoyed playing large cabinets, usually on their own.....but had loads of fun with an Aguilar DB810 and DB412 together. They sounded fantastic together, but on their own....not really. I've often though that since I had such good luck with bigger cabs / stacked cabinets that it was because these cabinets had better dispersion. I've read a lot that bass does better in a vertical column for overall dispersion. It also depends on if the cabinet is sitting on casters or flat on the floor for the added coupling effect. I guess that depends on the floor construction as well (don't want to get into rooms just yet) What I'm getting at is may is what I've been pondering recently. Would it make sense to build a nice wood box to raise a bass cabinet off the floor? That way a smaller cabinet will actually better project at ear level? I have obviously worked with two cabinets and turned on off......and it didn't change a whole lot.....but what if the riser was engineered to aid in projection? Has anyone ever done something with this before?