Very good story, Peter.
I enjoyed it!

Thanks.
Not very talkative this time?!  ...just teasing
I just wanted to try your software in its best form.

Hi Peter,

In order to use your Arc Prediction at 705.6/768kHz is there an existing USB interface for a DAC short of your NOS 1 USB DAC?

Ah, OK.
So the USBtoI2S is inside your DAC.
What brand do you use, if I may know...

Peter,

in your signature you quote a "PC-to-I2S Driver latency *40960* samples @*705600*".
Is this a sort of USBtoI2S interface?
Is I2S connected to your NOS1 DAC through HDMI or RJ45?
Am I totally off? 

I am not sure I understand your explanation for the NOS1 DAC. Can you please say technically how you isolate USB receiver from PC?

Also, what is XXHighEnd's CPU consumption on a 2100 at 32/768? Sorry to ask again...

Having a DSP Host in XXHihgEnd it is a good enough reason to have ASIO as well :-)

Hi Peter,

thanks for your reply. Don't you worry I have many other questions for you! :-)

Are you saying that XXHighEnd has virtual 0% cpu consumption on, let's say, a 2100 at 24/768?!

Apart fron useless Win services, which can be deleted or frozen, I have seen that altering OS footprint (XP can be shrunk to less than 20MB) does change audio playback, even through USB or FW. Are you saying that with XXHighEnd this is not needed?!

You probably know that part of cMP2 project is to limit EMI/RFI by reducing the amount of elctricity going through the circuit. Do you feel that this kind of approach is not needed for XXHighEnd/NOS1 DAC? I must say that a cMP2 system, although is slightly reduced in "number crunching point of view", it is also much snappier than a similar untouched PC. (I am not promoting cMP2 - I am just checking if cMP approach can be useful)

In electrical terms, what kind of isolation from PC does NOS1 DAC USB receiver have?

Also, given that NOS1 DAC has ASIO support, will XXHighEnd get ASIO support as well?

Hi to all!

Premise: I do not use XXHighEnd nor Phasure NOS1 DAC, although - Peter knows it - I would have liked to lay my ends on the latest one.


I am attracted by the concept of having your DSP in a PC and send an upsampled digital signal to a filterless DAC like a NOS1. I would like to discuss its implication.

I can see that there is a future proof in dealing with software, rather than hardware through repeatedly changing a DAC. We keep one device - the DAC - unaltered (more or less) and "change" what it is ahead of it.
Fine!

However, what are the implications of having extensive calculation in the PC? I mean, in terms of noise, distortion...
I have a good experience with cMP2, a digital playback system perhaps some of you are familiar with. This project was started to have a PC Transport with the cleanest possible digital signal coming out. In order to achieve that various things are implemented at hardware and software level: separating CPU, MB and peripherals power supplies, stopping all Windows unused services, underclock and undervolt, various kernel mods...
In these terms, a cMP2 system becomes a very lean and mean music dedicated machine! :-)

So my question is: as PC changes quite dramatically with such HW and SW optimisations, and they influence also asynchronous DACs, what is needed for a 2ch 24-768?
For example, what's minimum CPU requirement?

In my experience one cannot take any PC, with a usual ATX PSU, and slap a 24/192 oversample on it and think that quality is going to be guaranteed, even less at 768!