My son was born during my first few years of more serious interest in audio. He's ten now. I have never taken the chance of using speakers with the grills off.
My paradigm studio's (v.5) all sounded more cohesive with better imaging with the grills on. I think they were designed so that the grills helped with dispersion and less diffraction.
Can't really tell with my kef's. They may sound more crisp, slightly better details with the grills off but it could just be in my head too.
Both my kef and my paradigms looked equally good with grills on or off but because my paradigms sounded better with them on, I left them on. My kef's grills come off and then go back on every couple days just cause I'm weird like that.'
The decision needs to be made by your ears, your heart, and your soul. There is no right or wrong. For me and my Revels, grills off. For you, it may be different. The best part ? ... it's a zero expense experiment ! Listen to your speakers both ways, and have fun deciding which way sounds best.
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