Speaker wire/cables tend to be an upgrade not spoken about often enough. Unless you know to upgrade them, you wouldn't really think to do it. At least, I didn't. Not at first, anyway.
Notice the small pair of speaker wires I'm holding? Those are the ones that came with the speakers. These were not cheap speakers by any means and are pretty powerful, and yet...the manufacturer thought that these teeny weenie speaker wires would be all that I would need. Man, they couldn't be more wrong.