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Well I ran the comparison tests last night. Unfortunataly, Avia only has frequency sweeps, not a series of individual tones. Fortunately, they were low frequency sweeps (most people claim to hear better bass on coax). I set up a sound level meter on a tripod at the sweet spot and I ran the front speaker sweep and the sub sweep over and over. At specific frequencies (as listed on the TV), I recorded the levels. I repeated the test with both optical and coax and found absolutely no difference. I also ran the pink noise tests since they were quick to do. Again, no difference between optical and coax. I only wish there were individual frequencies that stayed constant for a few seconds. It would have been a more rigorous test.
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