AAC or DTS

[Anakunda]

Hello I wanted to ask users if they hear a noticeable difference between DTS or AC3 and AAC made from it at bitrates 64kbps per channel, which is approx. 400kbps per 6channels, eventually Vorbis at quality 5 which is approx 80kbps per channel. I don't hear any difference but maybe my ears are not too good or I don't have sufficient equipment :D

[[P]ako]

I claim to hear differences between 128 and 192 kbps mp3's but that may be I am hearing things. If you don't notice any difference then what you are doing is fine since you are encoding the videos for yourself, then what's the issue?

[Anakunda]

Don't know :P just need to know howmuch the difference between DTS and AAC is noticeable commonly ;)
Just in case I get a better equipment and will hear some terrible differencies on videos that I'm having now and seem sound wery well
Then if AAC is really diff, I am tinking about Vorbis at Q5, i think this should be near to transparent unless DTS uses any extended audio dynamics.