Hi Hutzal,
If what you were hearing was a combination of boundary effects plus the little M3 bass hump, you'd hear it on all the male voices (or female alto voices) regardless of the source.
Miking does vary quite a bit from one movie to the next, and sometimes microphones that have uneven response (bass output is boosted when the microphone is placed close to the actor) are used for whispered or "sotto voce" dialog. In the latter case, the upper bass coloration is very noticeable and annoying.
But if you didn't hear it from the Matrix Revolutions movie, then it's not the fault of the M3's location or boundary effects from the wall.
Last night, with friends and colleagues, I watched part of a truly terrible movie calle "One Night With the King" (avoid it!) with highly uneven microphone technique that varied from one scene to the next and made for lousy dialog intelligibility.
Regards,
