You will have to conduct some listening tests to compare the quality of your AC3 sources with AAC at different quality levels (using some high quality audio sources).
In my experience using the Nero encoder you can go as low as 0.30 for the quality level. This translates roughly to an average bitrate of 96 kbps for stereo and 192 kbps for 6-ch audio. (You should use quality based conversions, not bitrate based).
You might get better quality by replacing Nero with Qaac. There seems to be consensus that Qaac delivers slightly higher quality at lower bitrates. The quality values for Qaac do not match the Nero settings, a Nero setting of 0.30 is roughly equivalent to a Qaac setting of 37.
Cheers
manolito
Last edited by manolito; 20th April 2015 at 18:35.
|