XXHighEnd - The Ultra HighEnd Audio Player
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 31 
 on: November 17, 2017, 01:09:08 pm 
Started by Nick - Last post by PeterSt
Quote
In some post I read that it has to do, as you mention, with the grounding of the USB cable and the dac.

Hi Juan,

I don't think that I said - or am saying that (but with the notice that your sentence is hard to interpret by me, which by coincidence counts for the whole of your post (somehow)).

All I can say for real is "No, I never said that" and thus I can't bring value into your suggestions.

Quote
I observe a variation of the dcoffset from the reference value, 0.77 / 0.55 to 0.98 / 0.79, maybe more. When I unplug the dac, the reference value only lasts a few minutes and then gradually increases until reaching the aforementioned values ​​where it remains stable with small oscillations.

That this change is occurring is known (also see your email (for everybody) about the New DC Offset), but that this is under the influence of "ground loop" or what it is, is/was not known to me. As you will recognize from the email, I say "when cold" and "when warmer is may vary 1mV).

What's interesting with this, is that this can well be "caused" by the galvanic isolation in the USB chain. "Caused" between quotes and merely a "happens since".

Regards,
Peter

 32 
 on: November 17, 2017, 12:48:17 pm 
Started by manisandher - Last post by manisandher
Hey Peter, I'm having a problem decoding MQA. I've only tried a couple of albums from Tidal, and both give the same error (below) just before playback commences.

If I switch off 'decode HDCD + MQA', then everything works fine.

Any ideas?

Mani.

 33 
 on: November 17, 2017, 08:10:44 am 
Started by Nick - Last post by juanpmar
Peter, after some time without unplugging the NOS1 I observe a variation of the dcoffset from the reference value, 0.77 / 0.55 to 0.98 / 0.79, maybe more. When I unplug the dac, the reference value only lasts a few minutes and then gradually increases until reaching the aforementioned values ​​where it remains stable with small oscillations. I can not say that due to this I notice a deterioration of the SQ but it is certain that when the dac, the Audio Pc and the USB cable are unplugged for one hour or two, an improvement of the SQ is noticed.

In some post I read that it has to do, as you mention, with the grounding of the USB cable and the dac. I have removed the black wire from the grounding of the NOS1. Previously I was isolating the USB cable to avoid touching the Audio Pc chassis, then this isolation was combined with the Intona and now it continues with the G3. Are normal these variations of the dcoffset because they are the consequence of the absence of grounding? Is there a point when the variation of the dcoffset is stable (more or less) in the highest values when should all be unplugged?

Regards,
Juan

 34 
 on: November 17, 2017, 06:59:42 am 
Started by Nick - Last post by PeterSt
Quote
Yep, you've gotta power cycle both the nos1a and the pc or the sound eventually degrades.

Or maybe power cycle the PC and unplug and replug the USB cable.

There's so much going on with that USB ... you don't want to know. If you already look at the DC Offset on the NOS1-USB and how this is influenced by the USB cable with the PC Running ... So when DC Offset is in order it can only point at some groundloop going on (but now over the interlinks). So envision what actally happens when that groundloop can be broken by replugging the USB cable.
Btw, normal situation of breaking the groundloop is by detaching the connection to the output (which is the power to the DAC or to the DAC board Sw#2).

Peter

 35 
 on: November 17, 2017, 06:51:31 am 
Started by dsm - Last post by PeterSt
Hi all,

This should be the final one (download it below).
Now not only the issue is covered for when it happens (as in the X2 version) but also the cause has been found and taken out. This cause has been in there forever (since the last 0.9z version), but was challenged for because of a 80 second time window where things could go wrong which window previously was way shorter (think a few seconds). All related to how playback stopped (implicitly would incur for the wrong situation) and how fast a new Play was issued.
The noise could happen fairly soon when the new Play was issued, but also at the second track of that when the first was shorter than 80 seconds (minus how fast you could re-issue Play).

Thank you all for your help on this one !

Peter

 36 
 on: November 17, 2017, 06:10:10 am 
Started by Nick - Last post by acg
Yep, you've gotta power cycle both the nos1a and the pc or the sound eventually degrades.   I don't really know why.

 37 
 on: November 16, 2017, 07:12:33 pm 
Started by Nick - Last post by Rmalits
When I was writing my last report here Nov. 14th, I had my equipment running continously for 8 days.
The next day I rebooted the audio PC and switched the NOS1-a off and on with an interesting effect: The too hard, a bit annoying basses in some tracks were gone. SQ was well balanced over the complete frequency spectrum. There wasn't this kind of too much dynamics in the sound any more.
So, probably I had kind of low level distortion after running the systems for 8 days, what I could realise well in a few tracks only. I dont't know if it was something like Peter is describing above. For sure it was on a pretty low level and therefore a bit hard to dedect. And I changed the Q parameters a lot during these 8 days and therefore believed that this caused all the changes of SQ.

I had only time 2 or 3 hours to listen then and I don't know if it's the rebooting of the audio PC or the switching off/on of the NOS1-a what brought this positive effect or maybe both.
I will do some more investigation on this when I will be back home next week.

Kind regards
Richard

 38 
 on: November 15, 2017, 12:07:59 pm 
Started by dsm - Last post by PeterSt
X2. I will remove the X1 upload. Sorry for the confsion !

Peter

 39 
 on: November 15, 2017, 11:41:11 am 
Started by Nick - Last post by arvind
Hi Peter,

After various trials with the Q & SFS, in my set up, the best settings are as per my signature. However Q14/xQ10 also gives very good sound. Maybe marginally lacking in the bass punch, but overall a good balanced sound.

Best regards,

Arvind

 40 
 on: November 15, 2017, 10:53:35 am 
Started by dsm - Last post by BertD
Which version of Engine 3 should I replace?

X1 or X2?

I have the scary noise here also once in a while and if this is the tweak to cure that then my heart will be thankfull!

Bert

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