ar-t wrote:
> Listen to a system with lots of jitter, and one with much lower jitter.
> If you can't hear the difference, then I guess is doesn't matter to
> you.
This is silly. Where am I supposed to find said systems with "lots of"
or "lower" jitter?
If you are on this list, you most likely have a SB3 or Duet or
Transporter. Any of them particularly terrible? I would expect that TP
to be fairly good, but what metric is used? For years, I ran the output
of a SB through a Benchmark DAC-1. The Benchmark folks claim that their
DAC is immune to jitter. I suspect that their claim is marketing, but
how can one tell?
I've read that the "jitter" measurement that JA uses at Stereophile is
meaningless, yet he devotes column inches to it each time he gets a
transport or DAC.
What metric of jitter is important?
What devices that we are likely to have are examples, good and bad, of
this measured thing?
"When you can measure what you are speaking about, and express it in
numbers, you know something about it; but when you cannot express it in
numbers, your knowledge is of a meager and unsatisfactory kind. It may
be the beginning of knowledge, but you have scarcely, in your thoughts,
advanced to the stage of science."
Popular Lectures and Addresses, Lord (William Thompson) Kelvin.
I tried for five years to get a PhD in Software Engineering based on
measurements of software, preferably measurements of quality or even
quantity. I failed. There are no measurements of software that mean
anything. Nothing like power, frequency, pressure, etc. that real
engineers use to design products.
I hear people talk about jitter, and use "less jitter" to justify huge
expenditures of hard earned cash. But I've seen zero science or
engineering to justify what is good and what is bad.
Without some science, I don't believe in jitter, and I don't believe it
matters.
--
Pat Farrell
http://www.pfarrell.com/
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