[asynchronousman]

Yes, and I could probably synthesize a bland, monotonous 5 kHz tone myself...I'm reminded of the political catch phrase when I point out, "It's the harmonics, stupid!" (No disrespect meant at all)...Just as color needs complementary hues, sound needs harmonics.

Before we get into bandwidth hoohah, here it is...

535 LSB|----10 kHZ----||545 carrier||----10kHz----|555 USB

(an example).

It's been capable of that since at least the 1930's, and in the early 90s, with AM stereo, some were pushing it to around this:

529 LSB|----16 kHz----||545 carrier||----16 kHz----|561 USB

Digital looks something like this (oversimplified):

~530 LSB|10 kHz IBOC-AM|*Analog 545-530||545 carrier||*Analog 545-550|10 kHz IBOC-AM|560 USB

(an image, phase modulated or similar to FM, will appear at every 30 khz or three channels out upper AND lower sidebands, due to the nature of the IBOC signal, wiping out any weaker signals at that frequency).

If you owned a GM car radio from the late 50s or early sixties built with tubes and especially that plate reverb, please do not tell me how low-fi AM is. You would know better.