If you want bass from a given box and driver, you have to reduce sensitivity. if you want efficiency, you lose bass, if you want both, you need BIG boxes.. The "E" series were an attempt at efficiency-first, so you get not very much bass, a screaming mid and rather agressive treble. Suitably matched, these can be enormous fun, but get 'em wrongly matched or set up, and you'll get hearing damage
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me