1/4'' ding / chip on a glossy black speaker

Not a problem, Zd! We're both trying to help the OP. Happy listening!

I've found a black Sharpie very valuable for hiding minor dings/scratches in black finishes too. The tough part, personally(being somewhat obsessive), is forgetting about it afterwards.

Like I said, "Unless your cabinet is metal: forget about it!" That DOES allow for the possibility of the OP's cabinet being metal. In that case; he would have to have the entire cabinet stripped(sand blasted), as powder coatings cannot be touched up. Chips in powder coating can be filled in with conventional paints, but- that never does look quite right.

Enamels and epoxy paints can be applied to any other type of
paint. Most enamels don't sand or rub out as nicely
though(too soft). Lacquers have more aggressive thinners that
will cause problems, if applied to other paint systems.
Power coat? LOL! Power coatings are electrostatically
applied(sprayed/surface has to conduct electricity) and then
baked, at almost 400 degrees(F). Unless your cabinet is
metal: forget about it!