I encode with QAAC 2.68 (CoreAudioToolbox 7.10.9.0).
Here are some bitrate I use for different audio types:
- 48 khz, stereo = 224 k
- 44.1 khz, 5.1 = 512 k
- 48 khz, 5.1 = 640 k
What bitrate do you use for 5.1 and 48 khz audio to achieve transparent result?