We can all guess ... but the truth is in a trial. You can try to order spare grilles from the manufacturer of your speakers. Cover them with diferent materials and LISTEN. I'd be interested in what your ears tell you.
WAF (Wife Acceptance Factor)and Speakers
How important is the fabric on speakers to their sound? If I changed the covers of my speakers to a more decorative fabric to please my girlfriend, would that really be a big deal? Obviously, I wouldn't cover them with wool blankets, but would, for example, a light silk really sound that much different than whatever the manufacturers use? Given that many audiophiles think that the shape of their AC cords dramatically affect the sound, it is interesting that no one seems to discuss this topic. Any ideas or advice would be greatly appreciated.