On 22-01-17 11:30, Phil Allison wrote:

** That is a really worthless test methodology.

True, but still better than sighted listening.

The principle is that of INSTANT change-over, while listening in
stereo, in your home to your best loved tracks.

Yes, an A/B switchbox is great - if you have two separate
audio chains to compare. For comparing two different source
files, you need player software that can do the same in
software. Foobar2000 has an ABX function for comparing
music files that allows you similar instant switching
between the two sound files.

Julf