Get better cables than the stock ones, but don’t spend ridiculous sums on them. Even modestly priced third-party cables (in my case, I spent the princely sum of about £30 or so) can improve the sound. It may not be a massive jump, but I’d hope it’d be noticeable. And replace all of the cables because one part of the connections between the components of an audio system can let the lot down. In my case, I think it was a vastly better USB A-to-B cable that helped the entire system sound better. But don’t spend silly sums of money.