Quality degradation when digitizing mono cassette

I'm getting a strange effect when archiving a mono audio cassette.
If, in Audition, I either... a)record in mono or, b)record in stereo, then mix down to mono, the quality if worsewhen compared with recording and saving in stereo. There is a definite loss at the top end of the spectrum with a resultant loss in clarity.
I'm guessing that if I just record one track - or record both, pick the best, make BOTH the recorded tracks either left or right and THEN mix down to mono, all will be well. Haven't had time to try this yet but am just interested as to why this would be happening in the first place.

It is because the azimuth of the playback head in your cassette machine isn't lined up accurately to that of the cassette recorder that the recording was made on. If you cannot get into your player to adjust the azimuth you are a bit stuck. The Automatic Phase Correction tool from the Effects/Restoration menu might help to improve the results. Otherwise your plan to use just one of the tracks might be the best answer.
http://www.euonline.org/members/continui/fieldrecordinfaq/azimuthdefined.htm

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