Rod Speed wrote:

The last one, the old web cam, is certainly better with more high
frequencys
but the other 2 are quite acceptable and I don't hear the grossly
excessive
bass and booming you complained about initially.

That is fascinating and reassuring; many thanks. I'm wondering if the
unacceptable sound is a product of my PC's playback chain rather than the
sound itself.

I'll try playing the same file back through my main sound system and see (or
rather hear) what happens.