Step 2: Prepare The Speaker Grilles
If your speaker contains a scrim cloth, gently remove the cloth from the backside of the grille before painting.
Step 3: Painting Your In-Ceiling or In-Wall Speaker Grilles
Use high-quality spray paint and apply several thin coats of paint instead of one heavy coat. Ensure that the grille perforations remain free of paint — filling them with paint will diminish the speaker's sound quality. This will help prevent the perforations in the grille from being clogged with paint. If any perforations are plugged, use compressed air to blow the paint out of the perforations.
Expert Advice: If you find any grille perforations that are plugged with paint after the paint has dried, carefully use a straight pin, sewing needle, or toothpick to remove the paint.
Be careful not to overcoat the sides of your grills as many are a very tight fit. You will want to paint both sides of your speaker grilles to be sure you get along the insides of the perforations.