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Which combo would be louder?

Based on speaker area alone, I would guess the 1X15.

But there is more to it than that. The wattage is irrelevant as they are all about the same and none will use the full amount anyway.

Also, it is dependent on the sensitivity of the speakers that are loaded in each cab. If the 15" has a speaker with a sensitivity of 92dB and the 12" has one that is 98db, then the 1X12 will be louder.

However, given they are all by the same manufacture, I'd guess they are all about the same overall, but as seamonkey said...at what frequency?