How To Meet ACX Requirements Using Audacity

Here is how to how to pass Audible's ACX check using Audacity. If you are getting into narrating audio books, then you will almost certainly be using Audible's ACX marketplace. And to submit audio through ACX, that audio has to meet some very specific requirements. It can be confusing and difficult to pass the ACX check. If the audio doesn't pass, they will reject it. The two most challenging pieces of the ACX puzzle are meeting the average loudness target (between -23dB and -18dB), while ALSO making sure no part of your audio ever exceeds -3dB. Here is how you can do both of those things easily in Audacity with just 2 quick and easy actions. [UPDATE 2025] There a few changes in the limiter controls for Version 3.7. There is a new Limiter with very different controls. I've tried to find settings that work every time, but haven't found those yet. SO THE SOLUTION for now is to NOT pick "Limiter" but find "Legacy Limiter in the Effects menu. then you can successfully use the settings in the video. 00:00 Audible's ACX audiobook marketplace 01:05 Download and Install ACX Check Plugin 01:37 Run ACX check on your audio 02:22 Loudness Normalization 03:20 Limiter 03:55 Run ACX check and view glorious results