Eric, God didn't make no bad copper, so don't worry about "quality". In addition, theres no good reason to use extra wire just to make the runs of equal length. Stop by Home Depot or Lowes and have them cut you some of the regular 14 or 16ga lampcord. There's no need to use a jacketed cord if it isn't going to be installed in-wall.

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Enjoy the music, not the equipment.