Hi:)
The Difference is the Q-Factor. Not the Q you can change, the Curve you can see and hear.
Hybrid: UP wide, DOWN Narrow
Pure: The same UP and DOWN, very wide
G-Type: The same UP and DOWN, very narrow
E-Type: The same UP and DOWN, between Pure and G-Type
I can't hear any difference from the Sound itself, if you change all to have the same Q-Factor.
Bassman.