"Audio sideband" is a common term for AM or FM sidebands from dc to a few tens of kilohertz or a few hundred kilohertz. Not exactly the same as calling a 10-km

"Audio sideband" is a common term for AM or FM sidebands from dc to a few tens of kilohertz or a few hundred kilohertz. Not exactly the same as calling a 10-km wavelength EM wave an audio wave, though.