"Dennis Moore" wrote in message
news:XmFYa.61927$cF.21453@rwcrnsc53

Well Arny you may be right. The 400 I heard, and the three
120's I have heard sure sounded broken. Badly broken. Then
again a few minutes of them and my ears felt broken.

One of the things that distinguishes my implementation of PCABX to power
amplifier testing is that I test whether or not the equipment and the test
setup are working properly, within seconds on either side of the gathering
of data for the listening test, and with exactly zero physical changes to
the test setup. The identical same equipment, software, cables, and other
physical elements are absolutely unchanged for both the listening test and
the technical tests.

I don't believe that this level of quality control is achieved any other
way.

Besides, I thought you were going to run signals for your web
site through the up to spec 120 and put it on for us to hear some
time ago.

That's true. I got a little sidetracked into trivial pursuits such as
recording live music. Stuff like this happens with hobbies.

If you cannot pick that 120 out using your pcabx
software, I would have to declare the whole abx thing of limited
usefulness.

Declare as you will. The performance of ABX testing is pretty well
established, as is the effectiveness of the PCABX approach.

I see here a common problem, where people presume the quality of a test by
evaluating test results that they really have no more reliable evidence to
compare it to. Now, I'm not denying the evidence that you perceived, but in
fact you don't and can't know critical facts, like whether or not the
equipment you listened to met spec at the exact time and in the exact
context you listened to it.

I won't even get into the significant issues related to level matching and
bias control. However, given the freedom afforded to owners of home hi fi
systems and those who operate audio sales rooms I think I can easily do a
pretty good job of making figurative white appear to be black. The inverse
is only a little tougher.

Unless you can show us a typically broken 120 for
comparison. Because besides sounding broken all three 120's
I listened to sounded the same. I cringe thinking of the sound
of those things even thinking about it.

I decline to damage my equipment to satisfy anybody's idle curiosity without
adequate financial compensation.