Hi,
Without any apparent change to my setup, video files with aac audio 2.0 or 5.1 tracks a barely audible on my sound system now without turning the volume way up on my AV receiver.
It was never a issue before, and all other audio formats are audible at normal volume levels.
Tried playing the same aac audio tracks through my Sony UBP-X800M2 Blu-ray player to my AV receiver and they are audible at normal volume levels.
Seems to be isolated to the Vero4K