doc: I read, somewhere, that the human ear can't tell differences of less than about 1 dB. For the sake of argument, lets make that 1/5 of a dB.

You don't think that modern test equipment can measure to less than 1/5 of a dB in the audio spectrum?

I think that we are beginning to discuss an area that is much like discussing audio speaker cables. That is: some people just do not understand the RLC properties of cables and spend $1000s on cables needlessly.