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.
If they are really wood cabinets and you want them to have that natural look do this. Get yourself an experienced professional woodworker, by which I mean, woodpecker. They will make those cabinets look identical. Sorry, just couldn't resist. Check with the speaker manufacturer if you can. Hopefully they will give you some ideas. There is a lot that can be done with most speakers finish's.
The aforementioned auto touch up paint, if it looks like it matches color wise, works with just about any finish as it's more like sticky nail polish than normal paint.
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