Hi Steve, I'm a bit furher down the rabbit hole at this stage and significantly "toned down" my EQs and dynamics processing. Here's my latest effort: https://soundcloud.com/user-357226645/alt-sample-mixdown I made a chance discovery when I submitted a project outside of ACX. It was through Spoken Realms, and they provide a piece of software "2nd Opinion" that analyses the audio for suitable specs. It seems the way Audition calculates average RMS is different to the method used by Spoken realms, and by extention, the one used by ACX since the Spoken realms specs are identical and they publish to ACX anyway. Here's what Audition shows for the above sample: and here's what 2nd opinion has to say: For practical purposes, I work with the Total RMS in audition since that has a direct correlation with adding or subtracting db amplitude. As you can see from the stats, I'm bringing it to -25db which results in -22.07 average according to 2nd opinion - well within the tolerance for ACX. This seems to preverve the dynamic range fairly well while keeping things nicely audible. Previously I was bringing levels up to -22.9 Total RMS in Audition, thinking this had a direct correlation with ACX specs (they're a little vague on the point of whether they are looking for average or total RMS). Hence my comment about "a bit of a squeeze".
... View more