Well hopefully you've placed your sub in a corner which should help out matters. Nonetheless, as you stated earlier, "Most important is bass management.I need bass management with many options., it's puzzling that you chose a receiver which was completely opposite to what appeared to be your #1 requirement.
Well, the reason why i wanted bass management options is because i previously had a big headache with my old amp.It send LFE aswell as all bass to speakers selected as "large" even if sub is selected "Yes".
This ones better.LFE is send to sub only.And i have an option to select if the front bass is independent or send to sub aswell.This is the #1 option i wanted!
The Yamaha only had one advantage.Crossover setting can be changed, to 80hz.I think this is not necessary since my fronts can handle low bass.And the next largest speaker is only the center.
The JBLs bass is good tight.I think it would be better to leave it large.
Without knowing what JBL's you've got, it's hard to offer a comment. Having the ability to have different crossover options is something that's not to be underestimated. BTW, Accessories4less has/had that Marantz (refurbed) for around $300 or so.