Reddit user u/ILIJAC recently made a post about how he created special iOS ringtones. Mr. Cvetkovski is a sound designer and wanted ringtones that used the full potential of the iPhone X. He did this by testing the frequency range of the iPhone X speakers, and designed the ringtones with a specific EQ and limiter. By using pink noise, he figured out the frequencies in which the speakers sound distorted, and leveled them. Then he boosted the other frequencies where the loudness level is greater. This results in ringtones that are clean and at the maximum safe level the iPhone X allows. All of Mr. Cvetkovski’s ringtones are free to download here.
The new process might have baffled a number of people (including Jeff Butts), but once you know how it’s done, the method is actually pretty easy.