Good question. Perhaps your own or another speaker manufacturer can supply more information. Carl at this site is also a speaker hobbyist and may have tried different fabric. My old Castle Isis speakers would look super in a paisley print from Liberty of London. LOL. I tried Tukans with and without the sock and could detect no sonic difference, but is was very thin and translucent.
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.