It has been a little quiet around here since the re-design, so I figured that we might light it up a bit.
Let's talk about efficiency vs. depth.
Traditional thinking is that high sensitivity drives have no low end and low end drivers dominate bottom end sensitivity.
By forfeiting the top end, the triple X drives win the low end right?
I'll go ahead and nuke a hole in this theory and say that it is upside down...low sensitivity drives don't have any high end.
For example, here is the re-xxx in 8 cubic ft against another set of drivers in the same sealed enclosure, 8 cubic feet. I'm not saying which, but if you poke around a bit you can find them.
The re-xxx has no sensitivity advantage anywhere.
From 60hz up, they just suck 10X the power for a given spl.
As for maximum spl, the re plops out around 42mm +/-, so dual 18's with +/- 20 will be pretty much the same but at much less power.