@david_ten
Something else I did that I forgot to mention in my earlier post herein was keep a written log of the results. Seriously. I wanted/needed to "keep score" because often will be the case - especially if when trying blind testing/comparison - that in one instance you favor device A and in another you favor device B. Do that a hundred times and it could be worthwhile to reconcile the results from a written log, in addition to whatever other methods you use.
Something else I did that I forgot to mention in my earlier post herein was keep a written log of the results. Seriously. I wanted/needed to "keep score" because often will be the case - especially if when trying blind testing/comparison - that in one instance you favor device A and in another you favor device B. Do that a hundred times and it could be worthwhile to reconcile the results from a written log, in addition to whatever other methods you use.