) writes:
I'm 35. Engineer. And you?

I'm curious about the demographic that occupies these groups.

ANd this is a nonsense post.

You've cross-posted it to
rec.audio.tech
rec.audio.car
rec.radio.shortwave
ba.broadcast

Realistically they have nothing in common. Even the last two
are a stretch.

The question has no relevance in the first place, because
there's no context to the point of the question, and once
you cross-post there is nothing at all in common.

You might as well have asked "What did you have for breakfast"
because it would have been just as off-topic to all four
newsgroups, and be just been as nonsensical to the groups
as your actual question.

Michael