How does a UHD player effect sound?

[Nishe11]

Hi Guys

So i'm looking to dip into the world of 4k and having selected a display all i really have to decide on is a UHD player. I'm aiming to hook this up to the TV and a soundbar. I know there are only 2 options right now, the panny or Samsung.
When i was reading reviews of the two players it often commented on its audio performance, and that's confused me as i didn't think the player would be responsible for dealing with the audio as well. Does the player effect the sound quality ill be getting from my soundbar and kit? Would anyone be able to shed some light on this? Thanks i really appreciate the help