Following high demand from fans, Sony has confirmed that the PS4 will eventually support playback of MP3s and audio CDs, but not from "day one."....
....Internally, though, MP3 CD and DNLA features were something about which Shu and the PlayStation engineers thought "we are going to do it eventually."
http://cdrinfo.com/Sections/News/Details.aspx?NewsId=38594
Interesting. When I was suspicious the ps4 might not have cd len to read cd-format about a couple months ago, it turn out the ps4 does have cd len in it. maybe it was 3 in 1 laser lens. Because i remember reading the ps4 supports blu ray and dvd, i thought they don't support cd probably because it doesn't have cd reading len in it. But i was wrong. cool though. i can enjoy listening to cd audios on the ps4 in the future where i might buy one when it get even cheaper and games that might interest me.
I'm gonna take my lessons with the PS3. Some lenses were an all in one. Some, like my model had a separate blu-ray lens and DVD/CD lens. The only difference really is the color light and the width of the beam. I don't know why Sony used two lenses. Probably some technical reason beyond my comprehension or maybe it was easier or reasons behind the blu-ray technology.. When my PS3 stopped reading blu-rays, I could read CDs and DVDs just fine.
I didn't know sony uses 2 lenses for some ps3 versions. I think the reason why sony uses 2 lenses instead of all in one is to improve the longevity of the lenses and better reading accuracy of any discs compare to all in one. Say like discs that have dusts, fingerprints, or scratches is more lenient on seperate lens that were specify to specific type of disc than all in one lens.
it's a bit more expensive to use seperate lenses but overall better reading quality than all in one. Just a guess.
btw, what model is your ps3 that has 2 seperate lenses?