If you guys want good midbass stop looking at low effeciency high excursion drivers. 80hz and up is almost always effeciency limited, not excursion. At 150hz where alot of the main midbass kick is, mids run out of power handling before they reach xmax. Big drivers running down to 40hz is just giving you decent midbass that extends very low into the sub-bass region. Lots of power and 90db+ of effeciency is where it's at for drums.....