If your going to try this, Greg, I'd flip the speaker upside down, tape the sides off on the speaker to prevent overspray, and just paint the bottom to see how it looks before committing to the complete job. You may be able to find some alternate speaker fabric from a fabric supplier, or order some through Parts Express, Madisound, Meniscus Audio ect.

Half of communication is listening. You can't listen with your mouth.