OH okay. I'm getting it now. Thanks so much for replying. I played the blu-ray on my PS4 for the first time yesterday and it sounded fine to me (though I'm not sure I'd notice a difference) but since I'm definitely going to be using the CDs a lot more, I think I can live with whatever possible fault there is either way. I'd still be interested in hearing confirmation of the blu-ray disc having the same issue as the HD downloads or not, but I don't think I'd be able to figure it out myself. Thanks again.