In general, is it better for sound reproduction to keep the grilles off? I normally keep them on to protect the delicate tweeters that so often have been maimed in stores like CC, BB, etc. I would imagine that the more expensive the speaker, the more likely the grilles are better designed for transparency. I own all R series speakers except for the center channel, which is CS1 of the Monitor line. I know it will look a little goofy with the titanium face of the center channel and the rest being black but I'm not too concerned about that right now. I would like the opinion of other R series owners out there. Thanks!