[quote name='redstriper' post='1200996' date='Apr 15 2011, 05:34 PM']It was Alex who recommended the Eminence 3015LF to me and I can vouch for it's excellence as a woofer, but cab size also affects bass response and volume.[/quote]
It's probably the biggest contributor. Speaker diameter makes no difference as long as you're using enough cone to move air (PJB cabs use 5" drivers).
My MarkBass 2x10 is a LOT louder, bassier, cleaner & just all round better than the old Trace Elliott 4x10 I used before hand.