[Eeyore]

Arny Krueger wrote:

"Eeyore" wrote
Arny Krueger wrote:
"Eeyore" wrote
Arny Krueger wrote:
"Eeyore" wrote

You're aware that I've designed a fair number of
successful commercial designs I believe.

Yes, but you seem to be very worried about things that
just don't happen with the modern SS amps I've tested,
even fairly rugged cheap locomotives like the QSC USA
series.

The QSC USA series is a COMPLETE HEAP OF CRAP and
illustrates many classic design flaws and is a good
example of just how NOT to build a high performing
amplifier. The USA series is also most certainly not
*modern* by any reasonable understanding of the word.

If you can't hear the flaws of a USA series you must be
completely deaf.

Mere assertions with no supporting facts provided,
neither theoretical or experimental.

From listening.

Sighted evaluations.

Nothing explicitly wrong with those especially when the result isn't subtle
(which it wasn't). We are talking about GROSS differences here.

If I take a Ferrari out for a drive and then a Yugo and come back and say the
Ferrari was faster is that to be denied because it was a sighted test ?


I'm aware you dismiss any listening tests that don't
agree with your opinion.

If you mean that I tend to dismiss all listening tests, irregardless of
outcome, that aren't done in a professional manner, then I'm guilty as
charged.

Possibly you dismiss ALL
listening tests that can't be replicated by deaf people
using the ABX method too ?

What's this deaf people stuff Graham? You're talking trash! :-(

What's the THD of a USA series
at 100mW and 1W for example and what does the distortion
analyser output (Self's Figs 14 a,b ,c ) look like (or
provide a spectum analysis).

Tell us Graham. You're the professional engineer.

Why would you believe my measurements, Graham. In your view, I do ABX tests
with deaf listeners. If I'm that idiotic, why believe my measurements?

Bottom line Graham, you're running true to your - lots of lip, lots of crazy
accusations, and no reliable data. :-(

I'm not one for making great claims for being 'golden eared' and all that but it
is a FACT that certain people's hearing has more acuity than others. I've
recently been involved in tracing low level buzz and hum in a studio control
room along with 2 other techs and I was the only one of us 3 who could reliably
hear what the mix engineer was complaining about AND use that to trace and
eliminate the source.

Any testing using a panel will seriously degrade the likelihood of detecting
REAL audible differences by diluting the numbers whose hearing is up to the
task.

And ABX testing in its very philosophy seems to be more about detecting
differences that everyone can agree they hear rather than differences that only
a few can hear.

Graham