I know this has probably been discussed to death, but here we go again. I have Aguilar equipment, a DB750 and a Tone Hammer 500, plus two GS112s and a newer DB410 cab, all 8 ohm. I consider the TH and the one or two 12s my smaller rig, and the DB and the 410 my larger rig. After recently getting a new G&L LB100 (sorry about the name dropping) which I LOVE, I'm suddenly tempted to buy an Aggie DB115 cab, either to put under the 410 (used to have a SWR setup like that) or even play alone for a real old school sound. For some strange reason, I keep thinking a "P" bass needs a 15" speaker. And I keep hearing "Ain't no Mountain High Enough" playing in the back of my head? What's the general feeling out there about mixing speaker sizes, and yes, the 410 will probably sound louder because it's a more efficient cab. It would also boost the wattage of the 750, and we all know more wattage is a good thing. Does it make more sense than putting the 12s under the 410?