Alan Shaw says grills on give a flatter response. Sometimes you don't want a flatter response. But the difference is admittedly subtle. I prefer Grills off for listening, but grills on for background music while I work.
Anyone Using Harbeths with Grilles off?
Curious whether anyone prefers their Harbeths this way. I would imagine it's room dependent-- they are obviously voiced with grilles on but if your room is unusual (like mine is) maybe they sound better this way. The highs are getting eaten up by furniture and old ears and a strange loft type room at my place so it's working here.