Jonathan,

I've used plenty of portable intercoms, and haven't found one any better
than the David Clark DC-200.

Was a PSE among them? If so, I'd be really surprised about that judgement.

I have a DC-200 and expansion module (to make it 4 place) that I might
be willing to part with for a reasonable sum,

Oh, ok, now your above judgement makes MUCH more sense g.

--
Thomas Borchert (EDDH)