Ditto on the sub/no-sub thing. My Marantz doesn't really have any DSP modes, at least not in the "concert hall", "stadium", etc. sense, but it does keep the speaker distances engaged as well as level settings. Direct mode bypasses the sub, so that's just not very helpful with my M22s.

On some recordings I can tell a significant difference, and on others it's almost inaudible.

M22ti mains, EP175 sub, VP150 center, QS4 surrounds