Amir,
Recently I hear very audible distortion intermittently from my DX3 Pro. There's no distortion if I only change the DAC so I have concluded DX3 Pro is causing the problem. The distortion appears to be random because if I play the same track multiple times in a row there will be no distortion for several repeats and when it occurs it's at a different time point. I contacted Topping and this is what they said:
"Because the communicates between XMOS of our products and the host computer almost to the limit of USB2.0 High speed, it requires a very standard and stable connection.
Many USB cables, USB extension cables, HIFI USB filters, USB HUBs are not standardized enough. This will seriously affect the transmission of data, resulting in loss, delay, etc. Why not front USB, because front USB will connect to mother board via a inside cable, same reason, we could not sure this cable is standardized or not.
The various situations I mentioned above may lead to some strange and unclear problems. We have provided the same advice to users who have met such problems, and most of them have been resolved."
I am using their USB cable and my Dell XPS 13 laptop.
I was told that I could ship it back to China for repair but the shipping cost nearly $200! /facepalm.
Interested in your thoughts, Amir.
Thanks in advance for your time.