Joe
Use your fingernails around the edge of the grill cover and gently pull outward starting at a top corner. Once you get a corner out you can wiggle the cover to get it completely off. Do not force it as you don't want to bend the steel frame.
Although the speakers may look better without the covers, Alan Shaw recommends leaving them on.
Yes, voiced with grills on. Thanks!
I love them Bob!
I think Harbeth says to keep the grills on even when listening to music.