255c-LS Center Channel Speaker Grill fabric question

I plan to spray paint the grill to match the walls after I remove the fabric from the back of them. I would like to know if anyone has compared the sound quality difference with the fabric on and off the covers? I don't want to take the time to dye the fabric and reinstall it if the sound quality is better without it.
Also I plan to do the same with the RC85i speakers, so the same question applies to these. Thanks for your help.