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 81 
 on: October 19, 2014, 11:06:57 pm 
Started by CoenP - Last post by CoenP
Hi Peter,

Thanks for the effort. There are still hiccups especially when I move the arrow around the screen. That is at certain specific moments, probably when track loading takes place or there is competition over CPU priority. Something like that.

Also a new OS-X version since yesterday that I have not installed. (yet).

..On batteries it is slighly better than on mains not a night and day difference....

FWIW there is a (expected) difference between a charged laptop and a charging one with the power cable connected.

regards, Coen

 82 
 on: October 19, 2014, 10:50:38 am 
Started by CoenP - Last post by PeterSt
Coen,

I just sent you a possible newer OS/X driver (logically it is because your NOS1(a)-USB is older than that.
Let me know whether this helps.

Peter

 83 
 on: October 18, 2014, 08:21:03 pm 
Started by CoenP - Last post by CoenP
This might be (is) the reason that the SQ with my laptop is better than with the PC, much better.
The laptop sees the 19Volts only.

Now I have to look for a linear power supply for the laptop.

Hi,

Like the Velleman regulated supply. Cheap and effective? (!)

With my MacbookPro (i5, 2013) laptop I also got excellent sound with the 1a. I play tunes on A+ and a demo version of HiQplayer. On batteries it is slighly better than on mains not a night and day difference. Unfortunately no XXHE on the OS-X platform if it were only for the ArcPrediction filters.
The OS-X NOS driver may need an update since my little iFI nano DAC plays 384 without hickups even when I keep on working on the PC. No such thing with the NOS, i have to put up with an intrruption every now and then.

Regards, Coen

 84 
 on: October 18, 2014, 05:22:05 pm 
Started by CoenP - Last post by christoffe
Hi,

I also believe that the PC supply has a dominant role in suppressing this noise (or by not doing that). I am thinking right now about a linear base supply and switching local regulators. These linear supplies are much less tightly coupled to the power line. For an all linear supply I have to get a new system with less power consumption.

Regards, Coen


Hi,

This might be (is) the reason that the SQ with my laptop is better than with the PC, much better.
The laptop sees the 19Volts only.

Now I have to look for a linear power supply for the laptop.

Joachim

 85 
 on: October 18, 2014, 04:41:32 pm 
Started by CoenP - Last post by CoenP
Hi,

This is just about me having changed a highly tweaked  PC before the arrival of the nos 1a.
If you have good sound now, you will definitely have much better sound with the 1a.

Like Peter said, it's much more about PC psu noise than anything else. Contrary to the hardware changes, the software influence is much smaller than I was used to. Still cpu and memory can still pose a signature to the sound via the power consumption patterns of the BIOS and OS/software. Like having another device in the USB port or Ethernet enabled.

I also believe that the PC supply has a dominant role in suppressing this noise (or by not doing that). I am thinking right now about a linear base supply and switching local regulators. These linear supplies are much less tightly coupled to the power line. For an all linear supply I have to get a new system with less power consumption.

Regards, Coen

 86 
 on: October 18, 2014, 09:36:25 am 
Started by CoenP - Last post by PeterSt
if Iīm not wrong, that the NOS1a is not totally isolated from the PC hardware. Although I understand Peterīs last post this isolation issue maybe would need further details.

That isolation is 100% alright, but there's the mains part of it all. So like I always told : the influence by the (XXHighEnd) settings is one (I don't see that happening any more) and the "hardware" part is another. Thus for example how the USB connection can be better and worse and (surprise ?) how now the USB cable matters. Or possibly that always did, but now you can hear it (the NOS1a being so much better again).

It is really hard to work out the influence over the mains, but my guts always told me that the PC must be as lean as possible on the power consuption. Or better : as even as possible. So that is what I still do (like still using the 430MHz "speed") and no further devices attached to it. But I did not try to do it otherwise either ...

Peter

 87 
 on: October 17, 2014, 01:35:56 pm 
Started by CoenP - Last post by boleary
I'm not getting the NOS1a upgrade till sometime after the new year, but I've been wondering what folks have experienced regarding XX/PC settings. So, Coen, I really appreciate your last post! But now I'm a bit concerned that with the NOS1a, setting up an RDC with a laptop to control XX might cause SQ issues. Setting up such a connection is something I'm very much looking forward to. Maybe there is a trade off with an RDC connection which then lets one disconnect mouse, keyboard and monitor? Just wondering.

One more thing, maybe Coen's post and replies should be in a new thread about XX/PC settings with NOS1a?

 88 
 on: October 17, 2014, 01:21:37 pm 
Started by CoenP - Last post by juanpmar
Again the PC and surroundings is the all determining factor for SQ.

Hi Coen,

Very interesting your conclusions of that there is influence of the PC hardware in the SQ or, in other words and if Iīm not wrong, that the NOS1a is not totally isolated from the PC hardware. Although I understand Peterīs last post this isolation issue maybe would need further details.

Taking a look at the configuration of your PC I see that you are using a Megahalems passive cooling (no fans running), would you tell me please what Megahalems model are you using and, if possible, could you put some pictures of your PC? I still have three fans in my PC and I would like to try it totally passive.

You have also the "Power cable PE not connected, together with nos1 and poweramp in "audio" strip". Does it mean that the PE not connected is only the one in the cable from the power strip to the wall? or the power cables from the NOS1 and power amp have also the PE disconnected?

Would you please put your XX settings in your signature? sorry but I donīt remember.

Regards,
Juan

 89 
 on: October 17, 2014, 11:15:35 am 
Started by CoenP - Last post by PeterSt
Hmm ... in itself nice Coen !
Luckily I never admitted that the PC does not matter. Hard for me to try. What I do know is that I still have that one spinning small OS disk in it only, the music obtained over the LAN from another PC.

Regards,
Peter

 90 
 on: October 17, 2014, 11:00:37 am 
Started by CoenP - Last post by CoenP
Hi,

In anticipation of my NOS1a this spring, I reconfigured my audio PC for convenience rather than best audio. This was under the assumption the the expected SQ for the 1a -in my setup(!)- would be unaffected by these changes.

Making the DAC sing proved more of a challenge than I expected: it needed extra attention on the powersupply and I've been fiddling with Osses, settings, USB cables, pci cards, powerarrangements, cables, etc.

Only recently I arrived again at excellent sound and guess what: I'm completely back on my pre-1a best sound setup (save for the dysfunctional usb cable).
Unexpectedly the biggest progress was made by removing the second music harddrive, so much so that I consider to get rid of one of the remaining two.
Also the 'best' settings in XX are identical too.

Anyway it is now vey clear that the 1a is vastly superior to the nos, but also that I'm kind of stuck in win7 and 09e. Stuck but statisfied that is!

Again the PC and surroundings is the all determining factor for SQ. It all starts with a sufficiently quiet and stable powersupply. Maybe there has been enough progress on supplies that can do better than the current seasonic...

Regards, Coen

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