Is there any way to use the aac format to cut off only frequencies above 20 KHz? 2020-05-24 17:18:41 I've already tested several formats, but they either don't cut above 20 KHz or cut below 20 KHz, like 16 KHz. I know that Opus does that. But I would like aac like that, with only frequencies equal to or less than 20 KHz. So that you don't waste bits with frequencies above that, as they are inaudible. For example, the aac apple encoder maintains all of them. If I only use up to 20KHz, I can have more bits at the most audible frequencies (20 Khz or less). Is there any way to create aac files like that?