proper burn in for cd player

I recently purchased a Denon 5910 universal player with Hot Rod Audio modifications about a month ago. The thing sounded great out of the box compared to the player that I had before. I was told it will only get better with burn in time. I have been listening to the player with my favorite music about two to three hours a day. It does sound smoother than when I received it.

I was wondering if there was a commonly used method for burning in a player? I see burn in cds advertised, but I don't really understand the process.

Thank you for any help on this subject.