' process is exactly what
Slimserver needs in my view to make it accessible to the masses who
'don't do computers'.
Andy.
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many engineering companies start in very humble and low-profile
ways, whether they survive and grow is a good way top tell whether the
output from the 'shed' had any value.
Andy (inveterate shed-dweller ;) )
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the
output from the 'shed' had any value.
Sean can tell us the story of those first Slim Devices products, I bet
they started similarly.
Andy (inveterate shed-dweller ;) )
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Maybe one of Andrew Weeks' Super Regulators feeding a series-pass power
transistor might be the answer?
No need for an additional series pass transistor - a standard super-reg
can provide 1.5A continuous if built to current spec.
Andy.
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Andrew L. Weekes
to the DAC are the
same, hence the question above.
Andy.
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to trial tracks in your own home and only buy the
stuff that's actually any good, instead of paying over the odds for
what often turns out as a dissapointment scares them rigid!
Andy
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Andrew L. Weekes's
.
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Actually, I know there will always be some reflections, as nothing is
perfect, but I plan to do what I can to minimize the reflections.
You want one of these then :-
http://tinyurl.com/o4cbl
Andy.
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Andrew L. Weekes
with varying input sources, that would lend it
some credibility.
[image: http://www.benchmarkmedia.com/dac1/D-A%20JITTER%20TOL.gif]
The thing is this is just one spec the BM measures well on, who knows
what the audible effect of the ASRC circuit is?
Andy.
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of plastic, which I
guess gives my view on the state of 'modern' audio ;)
Andy.
P.S. I think you'll find the DAC1 is insensitive to jitter on the
SPDIF, it's a function of ASRC, but I don't think that will tell you a
lot about how it sounds overall!
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and can't do much about it.
That's where most of the problem lies - there's no such thing as a 75R
phono anywhere in the universe, no matter what any salesman might try
and tell you :)
Andy.
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Andrew L
http://tinyurl.com/do5ne
Producing 1.2V and 3.3V.
Andy.
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areas. Whilst the maths above, for example,
explains a mechanism for audibility, it tells you nothing at all about
an individual's ability to hear the effects, there are few absolutes of
'audiblity'.
Andy.
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Andrew L. Weekes
in what way exactly?
A transformer is the best way to do a good SPDIF, but I guarantee your
implementation cannot be remotely optimal.
Andy.
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That means that -35dB corresponds to a volume setting of 12 in the SB
0-40 volume range.
I believe you'll find the changeover is at 16 on the 0-40 range. That's
what the measurements indicate - below this value the old and patched
code measure identically.
Andy.
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Andrew L. Weekes
/ Dean, does this show on the D-Scope - it should?
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content - the music causes a rise in HF
content, which decays as the music quietens, which gives rise to the
'pumping' effect you can hear between musical phrases.
It strikes me very strongly as a processing / transcoding / file type
error of some description.
Andy.
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Andrew L. Weekes
clock that
totally determines the jitter performance at the DAC.
Everything is upsampled to 110kHz then fed to an AD1853 DAC, the ASRC
acting as the de-jitter process. Of course the internal clock has to be
low jitter (which it appears to be, from the measurements I've seen).
Andy.
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the performance =20k.
It's obvious to me that effects at the LSB of 16 bit audio are easily
heard and that engineering changes at levels around here or below have
audible effects.
Andy.
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to get 18 bits of actual analogue resolution, so the likelihood
is you'll get losses creeping in way before the full 8 bits of
shifting.
Andy.
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Honestly, how much can you really dress that up?
Well, the 16bit part is the only real limiting factor (unless you are a
bat ;) ) and since surprisingly few systems actually to manage the full
16 bits in actual reality, you may be surprised!
Andy.
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Another reason for using transformers, is they are just about the only
way to acheive any significant high frequency common mode rejection.
Trying to do this actively, is virtually impossible.
Andy.
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Purpose of the BigASS cap?
I thought it improved your bottom end :)
Andy.
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system. It
also tends to be ill-defined in terms of response to a transient
demand, which from my perspective makes batteries a poor choice unless
care is taken to limit the demands placed upon them, which ususally
requires active circuitry after them, to acheive this.
Andy.
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Andrew L. Weekes
to the inconvenience of charging and maintenance, they'll never
be my first choice, I've certainly never acheived state-of-the-art
performance with them. I've never tried NiMH, but have no reason to
suppose their chemistry makes them any better than NiCD for audio.
Andy.
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Andrew L. Weekes
and ready to receive the
SB2!
I'll then examine whether the internal switchers cause any problems,
now they are isolated from the critical analogue /clock functions.
Andy.
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the main distribution of jitter?
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.
As mentioned, Guido is very approachable and open, if a little busy, so
it may be worth talking to him, or reading some of his output in places
like diyudio.com.
Andy.
Andy.
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on this aspect.
Certainly in my experience the analog circuitry is of far less
importance than the jitter performance, I've changed a few things in
mine, including the op-amp and the coupling caps, but attempts to
reduce jitter have had by far the greatest effect on my SB2.
Andy.
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Andrew L. Weekes
to their response.-
Make sure they get one in their hands before offering solutions, since
without actually doing that first it's impossible for Trichord to know
what improvements you can gain from their advice.
Andy.
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Andrew L. Weekes
In the interests of science, would you do another test comparing your CD
player (assuming you have one) to the SB2 in a blind test.
The results may be interesting!
Andy.
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a lot, depending upon how well engineered they are in
terms of the SPDIF interface, the receiver circuitry, the clock
regeneration etc.
Andy.
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These links make good reading: -
http://www.benchmarkmedia.com/appnotes-d/jittercu.html
lots more here: -
http://www.pinkfishmedia.net/forum/showthread.php?s=threadid=10480
Andy.
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dominated by the digital
receiver's jitter transfer function. Most SPDIF receivers use a single
PLL, with a corner 5k, so any jiter below that remains unattenuated.
Andy.
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L. Weekes
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handicapped from the outset.
Andy.
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to stream a feed from an FM tuner to
the SB for best quality?
That all said, the convenience and access of either DAB or the
Internet-based stations are a huge bonus to me, and the 'Listen Again'
stuff really adds the icing on a great cake!
Andy.
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Andrew L. Weekes
the noisly supply feeds.
They also exclude all the stuff above 90kHz or so, that I can't measure
;)
Andy.
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wonder if the RA unit is suffering
a similar problem?
Andy.
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(and actual experience) the effect of a
better external supply is clearly audible in my experience. Measurement
in this relatively simplistic manner doesn't tell the whole story.
Andy.
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and understand and visualise jitter better, this little
FAQ may help: -
http://www.pinkfishmedia.net/forum/showthread.php?s=threadid=10480
Andy.
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