Compatibility question regarding a Chord 2Qute and a PS Audio Perfectwave Transport


After much deliberation I've decided on a 2Qute DAC and have located a used one in good shape.
My transport is a PS Audio Perfectwave memory player. I didn't think much about the compatibility of these two units until just now, when I'm about to buy the 2Qute.
....Here's the issue:
The PS Audio transport output options are (in order of quality according to the company), I2S, S/PDIF via balanced XLR, Coax via RCA and the optical.
The 2Qute's inputs options are: USB, BNC Coax and TOSLink optical.

Here's my question: From my reading it seems the 2Qute does much better with a USB input (the only input that's galvanically isolated).  Some go so far as to say if they had to use only the coax input on the 2Qute, they wouldn't want this DAC.
While separately the PS Audio transport and 2Qute are great, combining them forces you to use the coax connections which, on both units, are sub optimal.
....So you have two units that are pretty decent on their own and them combine them and have to use the least SQ optimal output/input.
Am I looking at this correctly?
Is this combination self defeating?
Kind of bummed as I was getting myself pretty sold on the 2Qute.
Thanks.
--My speakers, amp and preamp are Magnepan 1.7's, Butler TDB 2250 and a Modwright.
andrew-benn
Hi lowrider57,
From the PWT manual describing the outputs,
"The PWT offers multiple digital output choices including: XLR (AES/EBU), RCA and TOSLINK (S/PDIF) as well as I�S"

And in discussing the XLR output it further states,
" XLR. This is a balanced S/PDIF encoded output that complies with standards set by the AES/EBU (Audio Engineering Society/European Broadcasting Union). This can output up to 192kHz 24 bit data "
Here's the PWT manual link,
http://www.psaudio.com/wp-content/uploads/2011/11/PWT.pdf

In my original post, I got the " S/PDIF via balanced XLR " comment from a stereomojo review you can read here, http://www.stereomojo.com/PS%20AUDIO%20PERFECTWAVE%20TRANSPORT%20AND%20DAC.htm/PSADUIOPERFECTWAVETRA...

As this stuff is new to me, the quote I pulled from the stereomojo article could very well be "off".  --I wouldn't know the difference.  ....Although I'm starting to pick some of this up.
How do you read the PWT manual and what it says about XLR output?
as I interpret various statements in the manual for the PWT its XLR output appears to simply be balanced AES/EBU, presumably 110 ohms.
Andrew, I agree with Al’s statement that the XLR output is the typical AES/EBU 110 ohm signal used in digital devices.

If you want to experiment with sound quality, you can use the AES/EBU output with a passive transformer which will convert the 110 ohm signal to coax’s impedance of 75 ohms. The Canare transformer has received good user reviews...
https://www.bhphotovideo.com/bnh/controller/home?O=&sku=406162&gclid=CjwKEAjw19vABRCY2YmkpO2...=

I believe you will find the coax hook-up to the Chord to provide excellent sound as I did, especially since the PS transport is outputting a bit-perfect signal.
As mentioned, the cable you choose is important. That could be a potential weak link in the system, not the coax input/output.

Andrew, thanks for providing the link to the Stereomojo review. The reference to "S/PDIF via balanced XLR" in the review should most likely have said "S/PDIF encoded via balanced XLR." That would be consistent with what is said in the PWT manual, which also indicates that the XLR output is AES/EBU compatible (as stated in the excerpt you quoted). AES/EBU compatibility necessitates a nominal impedance of 110 ohms, and various other signal characteristics that differ from coaxial S/PDIF. AES/EBU and S/PDIF **encoding** is very similar, the difference being in certain control (non-data) bits. And surely the encoding that is used on the XLR output of the PWT would have been designed to be compatible with the AES/EBU inputs of consumer-oriented DACs.

Also, regarding the following comment that is stated in the review in support of I2S as being the best performing output...
The PWT uses an asynchronous clock that is completely divorced from pulling data off the optical disk when using I22 [sic]. Normal clocks float with the disk’s output and can introduce artifacts.
... while I wouldn’t quite classify this as techno-gibberish, I’ll say that it is not particularly meaningful and shouldn’t be taken too seriously.

Finally, to add clarification to my earlier comment about there being no coax to USB adapters that I am aware of: There are, of course, adapters that can provide many kinds of non-USB devices with a USB interface. However in all such cases that I am aware of those devices enable a non-USB peripheral to communicate with a computer’s USB "host controller," and would not enable a peripheral (i.e., a non-computer, lacking USB host controller functionality) to communicate with another peripheral, such as the USB interface on a DAC.

Good luck. Regards,
-- Al

lowrider57,
On this,
I believe you will find the coax hook-up to the Chord to provide excellent sound as I did, especially since the PS transport is outputting a bit-perfect signal.
As mentioned, the cable you choose is important. That could be a potential weak link in the system, not the coax input/output.
In choosing a cable do you mean choosing something that's exceptionally well shielded with low loss and good connectors?  There are coax cables like this that don't break the bank.  --Or do you mean venturing into more esoterically constructed cables that are high priced?
.....Or maybe you were referring to the proper cable length in your post?
What coax cable do you like?