No mention of room size, distances, or preferred listening levels, which may come into play. The Revel's impedance is on the low side, and they are not terribly sensitive,, so trying to fill a large space may tax the AVR.
The speakers are where 99% of audible tells arise from, and you chose well, so you have that particular problem solved.
If the Marantz is causing any audible tells I would be very surprised, but it's not exactly ideal for low impedance, low sensitivity speakers. It does have pre-outs, so external amplification is an option.
Having bass management offers marginally lower IM distortion and protection from being over-driven, but to get that in a stereo integrated is cost prohibitive, not to mention being hard to find. (Outlaw and Parasound are options, with crude but effective bass management, if they're available in your area.) And your AVR already does all that, so I don't see the need in your case.