Thanks to everyone for the input thus far. Some interesting
suggestions/points made. Actually, it was in hearing some of these
audio samples online a few years back that I started wondering about
DSP audio filters again (after the NTR-1 had basically put the idea out
of my mind a decade or so back). In fact, I believe it was the before
and after samples of the Am-Com ClearSpeech speaker that replanted this
idea in my head (although I'm a bit skeptical of whether or not these
sorts of pleasant sounding results are what I would really expect to
hear if I put this sort of a unit to work, say, dxing AM broadcasters
in the tropical bands).
One thing I don't particularly care for with regard to many of these
audio filters is the manner in which they so often provide limited
audio bandwidth. Is this the case with the ClearSpeech Base filter?
From what I've read, it seems that the Timewave 599zx has about the
widest bandwidth one might expect with these filters. How would the
bandwidth on the ClearSpeech Base filter compare? Is it of a narrower
range (e.g., would I suffer from the loss of bass frequencies in a way
that I might not with the Timewave)?
I'm reasonably satisfied with the notch filters I'm utilizing and
the audio low pass and hi freq cutoff provided by the VRC; so my
current interest in DSP audio filters has generally focused on
improving the intelligibility of signals that are mired in noise (and I
realize that there's generally a trade-off where this sort of thing
is concerned). Ron had mentioned that with regard to the Timewave
model, though, that "often the other features are what you want."
While I realize that the Timewave model is supposed to be a pretty
versatile piece of equipment, I must ask, with regard to SW BC
listening, what are some of these other features that might be
desirable that I'm lacking at present (aside from the fact that the
DSP filtration is perhaps more effective than the analog VRC)?
Thanks again to all...

J A Mulc...