NO NO NO NO NO! I'm no expert on audio, just have opinions, but I restore, repair and reproduce antiques for a living.
No sandpapers, oils, colognes or preparation H!
Find a woodworkers store like Woodcraft or Constantines or Garrett Wade. If none local, they're on the web. You want colored resin sticks by a company called Mohawk. They sell a complete finishing kit caled Concept 2000 geared toward DIY'ers. You find the right color, probably have to mix several sticks and melt the shellac into the scratch.We use a special iron, you could use a soldering iron and sacrifice a tip. The kit has "plane balm" you put on your finger to protect it as you smooth the repair. The sticks flow so well, however, you can usually skip this step. The kit also has a special little plane for removing the excess resin but the back of a very sharp chisel works as well. Then smooth the repair with a hard felt pad or 600 grit wet n dry using VM&P Naptha as a lubricant. Try to stay away from the non-damaged area as much as possible. Mist on (from 18") a few coats of lacquer, Krylon is okay. That should blend the repair. Don't overdo the lacquer, you just want to blend. Practice away from the workpiece. The materials will cost about $80.
Are Epos speakers expensive? You might get the repair done for $150 by a refinisher. If they are really expensive, look for a conservator. Antique dealers know who's good.
Good luck and let me know how it turns out. BTW, after all that, if the repair is out of the way, even us conservator's have been known to use a Minwax blend pencil or even a magic marker followed by a little of the wife's hairspray!