OMG, just removed my speaker grills and the sound just opened up to a new level!

GK....Let's chalk it up to the 'observer quantum effect'...or at least, it's a handy thing to blame it on...

One unconsciously feels that 'anything' between the driver(s) and your ears 'Must Be Doing Something'....

Either the air molecules are not able to 'pass through' the fabric/screen, or transmit the waveforms in the air without some resistance from said grille material in some fashion.....

Or we just prefer naked things in front of us.... ;)

ESL's aren't going to work very well without them...

f208frank's has a good rationale for being a future 'baddad' and current one for not being 'a tolerant host'.

That, and keeping the pets at bay.....

"....Dear, why is the cat in the deep-freezer?"

...embarrassing questions like that..... 

I don't have any of those 'issues', but just thinking....

(It hurts, but I've got to exercise the wetware....)

Hmm,  "Really nice looking magnetic grills"...…...
1. A statement that "I", shall never make.
2. (The form needs "must", follow the function). For them, "Grills", to be accepted,  "At all", in any meaningful way.
 Therefore; Those do not actually exist. Since a speakers design is for sound production/ reproduction. And any, "Grill", at least in this context. Adds nothing to the purpose of the object, "Speaker".
 And further, this is not a "Subjective", situation at all.

 That's my story. And I'm sticking to it!
 

I wanna know what Magico charges for replacing a poked tweeter...I actually asked somebody about that at Goodwins and the dude looked a little pale and said, yeah, it happens...didn't mention the cost.

It is a physical principle.
Try for example to speak with your hand in front of your mouth, or wear a mask and talk.
The material may be "sound transparent", but it will still be a barrier.
My advice is always to remove the grills when listening.
Put back once the listening is over, they will avoid the dust settle on speaker drivers.