Been reading with interest the new Atmos support in iOS 12 and heard some reports that basic sound quality has improved over and above Atmos with DD+. My question is; is it only the ATV4K that gets recent sound improvements because it’s only encoded in 4K movies or does the ATV4 also get some improvement albeit without Atmos? Trying to work out whether it’s worth me to upgrade to an ATV4K from ATV4. I don’t have a 4K tv, do have an Atmos capable receiver but only run it in 5.1. Would I get any sound quality benefit ?