I thought 80 (for the c5) was bad too, because the e11 bass boost was around 50. But for some reason it turned out better. I should check to see where the hell the xba 40's boost is located...
Anyway I'll see in a few weeks whether or not it's a good or bad match for the jh16. If not, I still got the e11, and if that don't work I can always get other amps. But for now it's really really good with the xba 40. Also note that there are others who have commented/praised on the c5's unique theater-like bass rumble, and they don't have the xba 40's lol.
edit: can't find the xba 40's frequency response chart! apparrently it's not good/popular enough for anyone to wanna make one!
Edited by chengsta - 5/6/13 at 5:48pm