Grills on or off, doesn't make a difference. They are designed to be anti-reflective and personally I take my grills off because I like the looks of the woofers and looks more hi-tech. But maybe you're looking at the speakers with grills off makes it look better and probably got you thinking it sounds better. he he

Axiom M60s, VP150, QS8s, EP500 -- Rotel 1075 & 1068 -- Panasonic BDT500 -- Panasonic 60S60