Back in 2005-ish a Clearchannel enginer, Littlejohn proposed narrowing bandwidth of Am stations to improve the signal to noise ratio. They implemented a 5 Khz bandwidth. Back in the 70s we were all blasting 12 kHz. While that's probably OK-ish for talk, it's dreadful for music.
https://www.radioworld.com/columns-and-views/the-5-khz-am-re...
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