Grilles or No Grilles

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My Infity Kappa 9 sound just fine with the grilles on and I could not not detect any difference with the grilles removed, so I leave the grilles on them all the time. However my Infinity IRS Betas have always been played naked. Every display that I've ever seen show the Betas without grilles. I think I put the grilles on them once just to see what it looked like....no dice, naked is the only way to fly with the Betas.
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The grills on my Egglestons were very transparent - both aesthetically and sonically. I heard no difference. It was a very elegant design (super thin, sheer) and I could actually still see the drivers when the grill were on, so I kept them on. My new speakers don't come with grills.

Gentlemen,
Vandersteen speakers not only sound better with grills they measure better. Any one who thinks they can hear a very sheer double knit grill double blind is most likely hearing the diffraction caused by improper grill frame design. Many of the worlds most expensive tweeters use wire mesh or fabric for protection without sonic effect.
Thanks Johnnyr

If a speaker comes with a grill its made to be used with one, in this insane anal hobby if a maker didnt think it was a good idea he simply wouldnt offer it OR he would sell it as an option....grills on, they look and sound better. As a closer if Johnnyr tells you sometihng you can be pretty confident its the truth.
And for those who say its there for protection and not sound I can name many turntables that come with no cover and are all things considered much more vulnerable to damage.

I have never heard a speaker that did not sound better with the grills off. However, some speakers look "but ugly" with the grills off.