I have a pair of dm602 s3 for almost a year now standing on an improvised stand. I just made it myself with 2-65mm diameter BI pipe with a 300 x 280 x 6mm metal base and on top is 200 x 200 x 6mm. Both are welded (fillet) on the pipe. They also look beautiful after having it painted with...
The best way to find any difference in the sound is to listen to speakers with eyes shut off while your wife do the trick on the speakers. We tried it with my B&W dm602 s3 and there was no difference in sound with grills on or off.