Hello,
is anyone experiencing noises/interferences from the D10s when connected to an audio chain via its analog outputs?
I have contacted Topping with respect to my issue and I am currently waiting but I have tried a few scenarios and I have issues with my device.
My previous chain was this:
PC (desktop) with on-board audio card connected via optical cable (previously I had a mainboard with coaxial SPDIF as well) out to a Yamaha AX2. I use the Yamaha as a pre-out for the main speakers driven by a Crown DC300A II.
Other speakers are connected directly to the Yamaha.
Attached to the Yamaha there are more devices, i.e. Teac CD player, AIWA tape deck, Sony PCM-M1 DAT, Sony PCM-M10 digital recorder, Dreambox 920, etc.
Whenever possible they are connected via SPDIF (electrical or optical), otherwise with standard analogic RCA cables.
The scenarios that I have tested are the following ones and I have never had noise issues with it before attaching a D10s to the audio chain:
1. Crown amp without any input:
Crown (no input, cables disconnected) ---> speakers
no "strange" noise (except home noises/neighboroud in the recorded and attached wav file 1, etc)
2. Topping analog outputs connected directly to Crown amp (RCA cable not fully plugged in the Topping analog outputs):
Desktop PC ---> USB cable (I also tried 2 different cables) ---> Topping ---> RCA out analog cables (L+R) NOT FULLY PLUGGED IN ---> Crown amp ---> speakers
DIGITAL NOISE AND RADIO SIGNAL coming out from the speakers! (but the radio signal might be normal with this kind of connection since masses are floating... what is not normal is what I called digital noise)
(I think that this scenario can be ignored because the RCA cables were not correctly plugged in, I just reported it because I had tested it)
3. Topping analog outputs connected directly to Crown amp (RCA cable correctly fully plugged in):
Desktop PC ---> USB cable (I also tried 2 different cables) ---> Topping ---> RCA out analog cables (L+R) ---> Crown amp ---> speakers
DIGITAL NOISE coming out from the speakers (wav file 3)
4. Topping analog outputs connected to Yamaha AX2 used as preamp to Crown amp:
Desktop PC---> USB cable (I also tried 2 different cables) ---> Topping ---> RCA out analog cables (L+R) ---> Yamaha AX2 analogic input ---> Crown amp ---> speakers
DIGITAL NOISE coming out from the speakers (wav file 4)
5. Topping electrical SPDIF output connected to yamaha AX2 used as a preamp to Crown amp:
Desktop PC---> USB cable (I also tried 2 different cables) ---> Topping ---> coaxial SPDIF out ---> Yamaha AX2 coaxial SPDIF input ---> Crown amp ---> speakers
NO "strange" noise (except home noises/neighboroud, etc)
The most noisy scenario happens when I connect the Topping to one of the two USB ports of my Vaio notebook (nothing is connected to the other USB port (it has only two USB ports)) and it is scenario
4d:
Vaio NB plugged into the electrical socket---> USB cable (I also tried 2 different cables) ---> Topping ---> RCA out analog cables (L+R) ---> Yamaha AX2 analogic input ---> Crown amp ---> speakers
Very high volume DIGITAL NOISE coming out from the speakers (I haven't recorded a wav yet)
I would rule out issues in the Crown and/or in the Yamaha, because they always worked good and they still do if I don't connect Toppings RCA analog outputs' to their inputs.
I would also rule out issues in the PCs because I used two completely different ones (a desktop and a notebook, each with its very own power supply. The desktop is using a Seasonic PRIME 600 Titanium Fanless power supply) and same is true for the USB and analog RCA cables.
The mainboard of the desktop is a Gigabyte GA-Z270X Gaming 7 and it also has a couple of ports specifically dedicated to attaching a DAC devices. I have tried these ports and also other ones but there was no difference.
I am also using an APC UPS for the Desktop and the notebook.
I also never had power issues in the last 3 months:
View attachment 79702
The attached wavs have been recorded with my PCM-M10 internal microphones at about 30 cm from one of the main speakers.
You can hear a clear difference between file 1 and 3-4. Consider 1 to be the "normal" noise of the room.
The D10s does not have a separate power plug so I can't test if this would change its behaviour...
Anyway I suppose that since the D10s expects its power to be taken from the USB, then doing so should not create issues in any scenario, imho.
Do you have any clue or have experienced something similar?
Luca