I am trying out a pair of the M3's and wonder about placement - does it matter how high they sit off the ground? My wife would prefer that they do not sit up too high. I notice that the M22's (which are about 6.5 inches taller) seem to be designed to sit on the floor - would the M-3's on a 6.5" stand do well? I am also thinking of trying the M22's - how do they sound compare to the M-3's?