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Topping A90 Static Issues (help please)

Joined
Jul 8, 2020
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#1
Just got this beauty and I was super excited for some A/B and enjoying my music :) Unfortunately, I am starting to hear white noise/hiss and more noise when I move my mouse when I'm plugged into the Topping.

Topping > Grace SDAC > Motherboard

Can someone give any tips on fixing this :(
 

JohnYang1997

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#3
You can also get a balanced SDAC or upgrade to a balanced DAC like schiit modius or soncoz la-qxd1
 
Joined
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#6
I also had some issues: clicks and distortion with the A90. I fixed everything changing USB plug position (plugging it as far as possible from Bluetooth/Wifi antenna), I have a USB-C plug at the back of my computer and used it to provide power to my DAC LA-QXD1, so I also changed that: now it has an independant charger. So now: USB PC -> USB LX-QXD1 -> XLR A90 -> XLR Neuman KH120A and HD650 work like a bliss.
 

mt196

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Apr 7, 2019
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#10
Whatttt lol actually? I'm learning new things everyday
I did it with mine and there is no noise, you just have to be precise in putting the tape just on that pin, you can help yourself with a needle.

Now I am waiting a custom USB with no gnd pin from pexon cables, to have a cleaner result
 
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B
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Thread Starter #11
That's very interesting. I was hoping I wouldn't have to spend another 50-100$ on top of this. Will report back after some testing and when my M500 comes in the mail this afternoon
 

JohnYang1997

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#12
That's very interesting. I was hoping I wouldn't have to spend another 50-100$ on top of this. Will report back after some testing and when my M500 comes in the mail this afternoon
There little chance having it since they have balanced connections.
 

Martin

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#17
My DACs doesn't work when power is grounded that is why I just suggested to pin the ground
The USB cables I use between my NUC and D50 and my Raspberry Pi and DX7 Pro are data only: no ground and no power. I started with electrical tape over the pins but now use custom built cables.

Martin
 
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Thread Starter #18
The USB cables I use between my NUC and D50 and my Raspberry Pi and DX7 Pro are data only: no ground and no power. I started with electrical tape over the pins but now use custom built cables.

Martin
That's badass. you build them yourself? Very intrigued about this process
 

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