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Old May 13th 07, 09:48 PM posted to uk.rec.audio
jaap
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Posts: 13
Default how good are class D amplifiers?

Don Pearce schreef:
On Sun, 13 May 2007 23:04:17 +0200, jaap wrote:

Don, I agree on most points but one (besides from reproduction levels,
which are measured in Bells and not Watts): your inability to
distinguish audible capacitor coloration. You hide behind your test
equipment, not knowing exactly what to look for. Is it the ESR, the
inductance, dielectric absorption? Do the test with open mind, you may
find yourself puzzled.


Who cares what you use to measure audio reproduction levels? You need
Watts to produce them.

As for capacitor colouration, *nobody* has to my knowledge ever
demonstrated an ability to hear it. Many have made the claim, and a
few of them have allowed themselves to be subject to a test - all have
failed. I suspect you could easily add yourself to this number.

I don't hide behind equipment. This is a claim you are making to Serge
too, and I have to say it is rather rude. I use equipment, I have
designed equipment and I have measured the characteristics of many,
many capacitors. I have also worked in recording studios (where I was
taught vinyl cutting by an expert). My mind is open - if I ever hear
what I consider to be an unexplained difference I will immediately
challenge myself to identify it beyond doubt. I have never done so
yet. It is your mind that appears to be the closed one in this debate
and this leads you make assertions that fly in the face of reason. So
you need to be self-critical. If you find yourself believing something
that doesn't follow logic, don't just assume that you are right and
logic is wrong. Assume that you have got it wrong until such a point
that you can demonstrate beyond doubt that you have it right.

One thing, of course. You must make the test blind. Your brain plays
the cruelest tricks on you when you are aware of what you are
listening to.

You do know that James Randi has a million dollars awaiting anybody
who can repeatably hear the difference between cables?

Go for it - you can buy us all a drink with your winnings.

d


Don don't be offended, I won't either. The logic behind colorations
associated with cables and capacitors are explicable by electrical
properties. I can hear the difference between five or six cables, even
more capacitors (I have hundreds to play with and I do!) and so can you
(I presume). Never heard from James Randi but when we meet I'll buy you
a drink, as many as you need to forget your equipment and hard obtained
knowledge. Then we have a (blind) test listening to beautiful music.

Best regards from the home of the worlds largest audio equipment
producing company ever.