There were quite a few actually, most of this was sony's doing. The most destructive was XCP around the time of MediaMax, which used randomness in what tones t

There were quite a few actually, most of this was sony's doing. The most destructive was XCP around the time of MediaMax, which used randomness in what tones they produced, which would damage speakers unpredictably. "MediaMax introduces a large amount of random jitter, making the disc sound like it has been badly scratched or damaged; XCP replaces the audio with random noise." Key2Audio was the first tech that comes to mind that did this, originally employed on Celinne Dione's "A New Day Has Come" album. It would cause all types of issues, but one being random audio blips that sounded like when you turn on a bitcrusher and press the overdrive, it's easy to see how this can damage a speaker. https://www.cs.umd.edu/class/spring2017/cmsc818O/papers/lessons-from-sony.pdf https://www.cs.umd.edu/class/spring2017/cmsc818O/papers/less... https://www.xboxaddict.com/forums/archive/index.php/t-10494.html https://www.xboxaddict.com/forums/archive/index.php/t-10494.... https://www.newscientist.com/article/dn2127-copy-protected-dion-disk-is-sonys-first/ https://www.newscientist.com/article/dn2127-copy-protected-d... https://www.cnet.com/tech/services-and-software/dion-disc-could-bring-pcs-to-a-standstill/ https://www.cnet.com/tech/services-and-software/dion-disc-co...