Best of intentions to respond sooner. I apologize for the delay. (Having an issue attaching samples, working on it.)
Via software I found, HPF @80Hz works very well.
Now, I have to find an 80Hz 12 or 24dB/octave HPF. And as I understand it, I need the impedance values for my equipment chain to build a correct HPF.
Thank you so much for the help and suggestions. I've learned so much the hard way (i.e. most recordings are garbage). Would be nice to meetup with some tapers in Seattle.