as for your m-audio try powering it from PC PSU where XX runs

you are missing the point.
It is not "dirtying" by USB power but completely opposite: XX does something that affetcts USB power so in this case it is oposite to dirtying, or "dirtying in a good way" so the sounds improves.

Yes but my point is that it is better to use power from usb (the same power supply where XX runs), than any other power even from the battery.

Because my theory is (as I mentioned before in other posts) that hte jitter magic treatment by XX is done mostly through PSU. So using different PSU for usb dac steals (removes) some of XX magic influence on SQ.

Hi All,

Did anybody tried a DAC which uses the power from the usb port, not from its own power supply.

I have a cheap USB audio adapter which I use with XX on Vista engine 3 .

And I noticed that if it is connected to the usb hub with its power supply it sounds worse (different ) to me.
As opposed to when the power supply is disconnected from the hub.

Yes yes... Again a jitter affecting over power supply voodoo stuff

Andy

One day I am going to get myself a turntable anyway...
I have still got a couple of records somewhere in my closet.

Oh yes,

And this leads me to an idea of jitter therapy, or jitter weapon, like tear gas for example

If we can't eliminate jitter let's try to control it or create our own jitter with given charcteristics. What's XX is actually is all about.

And we can use it to influence people. We could start with wives for starters and play with their moods as we like.
Ok I am being mean, sorry.

But I think in some tv channels they already use this technics of DSPing sound to create a certain mood of the channel's auditory.

Well after more listenening to s-0 and s-1 on XP
they both give me discomfort. So 0.9r (or pd) is the winner for now.

I understand that Peter may not paid attention what is going on on XP with new versions. no problem:)
So I will just wait that someday Peter again turn to XP users, as it was for flac and mp3 support
0.9 r is good enough for me on XP in the mean time

But according to the help file in XX installation folder, engine #1 is bit perfect in XP

Is it not true anymore?

Hi,

XP and new versions again.
the version s-0 I could hear that there certain improvements in SQ. but it gave that feeling paranoia again.
That' why I did not liked it.
But s-1 sounds better than s-0 (discomfort wise) in XP for me. First impression it is close to neutral, almost does not have a special signature to say, and does not get in the way between music and listener.
These are my first impressions after comparing s-0 and s-1 on XP.

Andrey

hi

I have no problems with flac on XP with new version 09.s-0.
Later on SQ...

Andrey

all the errorneaous reading as you say it and I understand it,
Is corrected by the means of the error correction mechanism in CDROM or in the SPDIF or USB interface.
Even if by wrong levels some of the 0 become 1s the algorithm has enough extra data to correct it. RedBook has two level of error correction.

inside the DAC this misinterpreatation is impossible. or again error corrected.
So the misinterpretations of 1 and 0 are not of the importance anymore. The data is not changed.

As I said before it is about samples apearing on the time line at a slightly different moment. Not enough to shift the sample to the next position a lot less than that, but enough to recreate (from interpolation) a slightly different waveform to be audible.

In the case of badly recorded CDR the data is still the same right?
But in this case the error correction processes come into play. Say they affect PSU power cleanness in away.

0.00002 seconds does not compare to the jitter values.

the jitter is in 10 to 500 picoseconds not milliseconds, refer to stereophile for measurments examples..

And also DAC clock is tied to the incoming form PC clock by means of PLL, in case of nos DAC.
And they cannot stray too far from each other by design. especially to read the next sample.

Hi Peter,

Sorry I always have trouble reading your posts. they always confuse me. My bad English probably.

So you saying that we get the wrong samples because time jitter is so big that it even points to the wrong sample.
No I don't think so.
And the bit stream is not changed and arrives at DAC the same from CDR.

The samples are points interpolating the analog wave. In theory these points should be at exactly the same distance fro each other to reproduce the right wave. If the distance has jitter, points moved a tiny bit to the side, we will get slightly different wave, but enough to be audible.

All those errors with missing samples are very very seldom, the data are the same and not corrupted. it all about when the samples appear on the time line. And this time jitter cannot lead to reading the next sample instead of current. Jitter is to small for this.

Hi Carlos,

It is nice to hear from you.

I used Roxio just because it was the only program I had on the PC at that time.
I wanted to show that this effect we are talking about here doesn't depend on the software or CD writer we use too much.
And I agree that any background activity influences the SQ of the CDR being recorded.
Also I said in the first post, that you can take your favorite version of XX and play it while burning CDR, and you will have CDR with the SQ signature of your XX version.

IMHO XX r I like best for now (in XP) and it is the most easily to tell it on the CDR.
And I could tell XXpd version from no XX running, though it was not so obvious for me.

Please note that all tests I did on XP. could not find how to burn CDRs on Vista (was too lazy to google )

About the PSU phenomenon.

It's all about the threshold crossing in the right moment of time.
So to generate 1 an 0 by crossing some threshold without timing errors (jitter)we need a perfectly clean power.
But if there is some irregularities in power consumption by say CD reading circuit in case of jittery CDR, these irregularities affect the power fed to other circuits too.

I hope I didn't stray too far in a fantasy with the above.