I'm thinking of doing something akin to placing an Avatar B210 on top of an Avatar B212 (Delta). Looking at the sensitivity graphs that Eminence provides for the Delta 10 and the Delta 12LF, it seems as though the 10s are quite a bit more efficient across the spectrum. However, if I've learned anything about cabinet design here, it's that what it looks like on paper and how it really sounds can be quite different. Of those of you that have paired a B210 with a B212, have you noticed if the 10s are louder? If they are, I might pair an 8 ohm 2x10 with a 4 ohm 2x12 to even it up by 3 dB. Any thoughts?