I 100% agree with Chayro, get out the Sharpie pen and do the best you can. After all, we're talking about a 1/4" defect - this is hardly something to stress about. Dim the lights and enjoy your system...
"06-05-15: Rodman99999 Like I said, "Unless your cabinet is metal: forget about it!" That DOES allow for the possibility of the OP's cabinet being metal."
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.
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