Just about every manufacturer makes a shallow mount sub these days, I have only heard a couple besides the original (the Aliante which is still a bench mark in many areas) but I am mighty impressed at the SQ of the Pioneer product and it is fairly loud to boot(a 12" pair can make ~143 db with moderate power)

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MECA SQ

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I don't know what your problem is, but I'll bet it's hard to pronounce.