I think that warrants a dedicated thread, because it's not a short answer. Suffice it to say, the results can knock you on your ass. Of course, the dual SB-16 Ultras help.
I don't know what the deal is, but my system sounds anything but impotent or lifeless without any additional processing. What does the Dynamic EQ do? FWIW, I do NOT use Audyssey, using a Marantz AV7703. I manually did EQ using REW.
You're running all the speakers full range? It appears that way. I suggest not doing that. For one thing, it can cause a lot of phase cancellation in the bass range.
Have you listened with no room correction, just to see how it compares?
Where is the sub located?