I'm no painter so I would find a local auto body guy to do it for me. I'd just remove the drivers, speaker terminals, etc. and drop them off.
Changing a speaker color
I’m considering buying a pair of speakers that are painted white with a finish like a piano black. Has anyone ever repainted a pair of speakers with a finish like that. I have a lot of experience woodworking, so this isn’t something new for me.
Jeff