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my system
#22
If we are getting technical now.....

I recall the Miller Audio Research measurements of the D170.  These indicated a signal to noise ratio of 118dB for the S/PDIF inputs, which is quite good.

The analogue input measured 93.2dB, which is a rather disappointing number in comparison.

Interestingly, the USB input measured at 97.7dB, not massively better than the analogue input.

Paul Miller has not performed equivalent measurements for the Pro, but Stereophile said this about the 140 Pro:

While the individual FFT bins in this graph lie at or below –80dB, it suggests that the 140 Pro's analog inputs are limited to 14-bit resolution.

Then we had this, which indicates that the Pro is indeed not that good via analogue inputs:

https://www.stereo.de/hifi-test/produkt/...-dual-1807

What the above suggests is that no mater how transparent anyone might think the analogue inputs are (and I think they sound pretty good), definitively this is not the best route to getting optimum performance from a Devialet.  14bits of resolution via analogue, whereas the 118dB s/n ratio figure is equivalent to about 20 bits.

One thing I have never seen is equivalent measurements for the CI Board.  Although this is asynchronous, whereas S/PIF is synchronous.  So maybe this is a reason that some of prefer the sound via AES/EBU, using kit like the MC3+USB and similar?  At least, I presume the CI Board is effectively asynchronous, but I am only assuming this because asynchronous is the "A" in AIR.  Does anyone know more about how the CI Board actually works and interfaces with ADH?

Of course, just because both USB and the CI Board are both asynchronous does not mean they would measure or perform the same.  Note the USB input is integrated into the CI board on the Pro, so this will almost certainly measure differently to the original Expert measurements above.

Lots of waffle here, but what I am suggesting is that @bernardl might find that using the MC3+USB + clock might produce some pleasing results (or he might not, of course), and quite possibly their might be a valid technical reason for this.  What is key to using the AES/EBU synchronous route is that the quality of the clock feed matters because this is extracted by the amp.

Per Bernard's post on the proceeding page, both options 1 and 2 are "bit perfect", but maybe some bit perfects are more perfect than others?
1000 Pro - KEF Blade - iFi Zen Stream - Mutec REF10 - MC3+USB - Pro-Ject Signature 12
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Messages In This Thread
my system - by bernardl - 13-May-2020, 10:08
RE: my system - by georgev - 13-May-2020, 10:37
RE: my system - by ssfas - 14-May-2020, 13:29
RE: my system - by bernardl - 26-Aug-2020, 23:22
RE: my system - by bernardl - 15-Sep-2020, 00:55
RE: my system - by sam1000 - 15-Sep-2020, 03:07
RE: my system - by philoouu - 15-Sep-2020, 06:33
RE: my system - by bernardl - 15-Sep-2020, 03:51
RE: my system - by bernardl - 23-Dec-2020, 13:47
RE: my system - by LeeC - 31-Dec-2020, 02:52
RE: my system - by bernardl - 03-Jan-2021, 00:55
RE: my system - by bernardl - 16-Jan-2021, 14:39
RE: my system - by bernardl - 24-Jan-2021, 02:39
RE: my system - by Axel - 24-Jan-2021, 09:10
RE: my system - by Confused - 24-Jan-2021, 12:38
RE: my system - by bernardl - 24-Jan-2021, 14:01
RE: my system - by Jean-Marie - 24-Jan-2021, 15:07
RE: my system - by bernardl - 24-Jan-2021, 22:36
RE: my system - by Jean-Marie - 28-Jan-2021, 16:27
RE: my system - by bernardl - 29-Jan-2021, 04:25
RE: my system - by Jean-Marie - 29-Jan-2021, 13:19
RE: my system - by Confused - 30-Jan-2021, 13:56
RE: my system - by bernardl - 02-Feb-2021, 07:51
RE: my system - by bernardl - 26-Sep-2021, 14:05
RE: my system - by bernardl - 07-Oct-2021, 00:23

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