

HAM will work best for long distance communication but does not have enough capacity to support local short messaging for any major population sizes. Mesh networks scale in bandwidth and will not be overwhelmed as easily if tens of thousands of people suddenly hop on it at the same time.




All digital devices will use some amount of memory. Audio devices are all digital these days and only use a DAC (Digital to Analog Converter) to generate the actual audio waveform from a raw sample stream.
On something like a standalone audio amp there still has to be the whole backend to store codec information, menus and settings, and a whole host of other controls and audio processing features that are likely implemented on top of a basic OS and not directly written to a microcontroller. There’s more memory than you think.