[Les Cargill]

Scott Dorsey wrote:

Roy W. Rising wrote:

A minus B Protocol:

Sum the out-of-phase, level-matched outputs of two test subjects. Listen
to the residual artifacts at *normal* (!) monitor level. If they're not
audible, they don't matter. If they are audible, which device is
contributing them the most ... and why?

Let the new mudwar begin! (I will watch from the sidelines.)


Sometimes colorations in the summing device become a problem, and in
the modern digital world where devices have latency it can sometimes
be a problem to deal with proper nulling.

But, this can be a very, very revealing test, and quantitative measurements
of the difference signals can be extremely useful, as well as qualitative
listening.

Doing this test on lossy encoding systems is absolutely fascinating and
gives you a real window into how they work.
--scott


With lossy encoders, you can save the original PCM and diff
it with the output. Add a single sample FS pulse to synch by.

--
Les Cargill