You can also adjust the treble by adjusting the "toe-in" (I assume the MWTs are similar to my 100s in this respect). Be sure to experiment a bit before settling on final placement/orientation.
Agreed with Martykl on this one. Although the Ohms (both the MWT's and the 100's) are fairly forgiving with room placement, their tonal balance will be substantially affected by toe-in, especially in the upper frequencies, and by proximity to rear wall and corners, as far as bass is concerned. You'll also want to play with positioning to obtain the best imaging and soundstage. With the right source material, the Ohms are astonishing in that regard.