I have been hearing for some time now some audio artifacts when listening to hi-res files (i.e: 48kHz 24bit 96kHz). This happens randomly and it’s frustrating… so I am reaching out if other users are experiencing this phenomenon with hi-res files. This issue doesn’t happen with 44.1kHz files so it’s rather a mystery to me.
P.S.: I have contacted Alvin from Vinshine Audio and next step is to ship it back so they can assess the issue.
Sorry, but this is confusing…
Are you using USB out from the Nucleus? And have also tried USB out from the Lumin T2?
And also using the iPad as a transport connecting to the Pontus USB via a Camera Connection Kit or similar?
But where does the “CD Player” come from in this equation? It surely does not output “high rez”?
Let me explain… I don’t use USB out from the Nucleus. I tried using the iPad as a transport connecting to the Pontus USB as you mentioned only to prove that the issue seems to be related to the Pontus hardware, don’t think it’s software related.
Now, have you tried other inputs on the Pontus besides the SPDIF/BNC-inputs?
Example; try an USB-connection from the Nucleus to the Pontus? I assume that the same issues were found using the iPad as a trasport also?
And one more question:
Are all sample rates within the 48Khz range affected? (48Khz, 96Khz, 192Khz, 384Khz)
And none from the 44.1Khz family? (44.1Khz, 88.2Khz, 176.4Khz and 352.8Khz)
What I proposed was not a solution, even though you may use it as a workaround. I proposed it as one of the steps to narrow down the issue.
It was to further confirm 44.1kHz multiple frequency clock hardware in the DAC is working.
Once you think it is tested enough, the next test is to test 48kHz from USB, since you were getting artifacts with 48kHz playback from BNC. To do this simply connect a USB cable from Lumin to the DAC (then set Lumin output to USB via Lumin app), or from Roon Core to the DAC.
If 48kHz from USB is also faulty, then you’d need to inform Alvin.
If 48kHz from USB works, but BNC is faulty - then you’d need to try the other coax input. This may require you to purchase a BNC (from T2) to RCA coaxial (DAC) cable, or use another streamer with coax output. In case your CD player has a file playback function that you can use to play 48kHz file, that can also be used for this test.
After a few hours listening to hi-res files using USB, I no longer hear any audio artifacts and to be honest I am hearing some improvements over BNC, better instruments separation, pretty flabbergasted to be honest! I think I’ll leave the USB cable and this will be the default configuration from now on.