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Driver size is more or less meaningless now days. I have heard subs that do "deep" well, both Danley and sort of Bassmaxx (B1's I believe). Haven't heard cinema-deep so can't comment on sub-20Hz. Have also heard deep that wasn't that accurate or loud (Bag End), and larger drivers that weren't very deep. My point is that keeping SPL and accuracy, even down to near 20Hz, is good even if not common or easy.
Driver size is more or less meaningless now days. I have heard subs that do "deep" well, both Danley and sort of Bassmaxx (B1's I believe). Haven't heard cinema-deep so can't comment on sub-20Hz. Have also heard deep that wasn't that accurate or loud (Bag End), and larger drivers that weren't very deep.
My point is that keeping SPL and accuracy, even down to near 20Hz, is good even if not common or easy.
