Topping TP-60 very noisy when connected to DAC (Fixed) - diyAudio
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Old 15th January 2016, 05:21 PM   #1
Skree is offline Skree  United Kingdom
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Join Date: Jun 2011
Default Topping TP-60 very noisy when connected to DAC (Fixed)

I'm just trying to set up my new Aune X1S DAC/Headamp and Topping TP-60 speaker amp.

When I connect the DAC to the amp, and turn the amp on, i immediately get massive noise, like the hum cheap pocket cassette players used to have when turned up high. It doesn't change if i turn the DAC off, it doesn't change volume when i fiddle the volume on the amp. It's not the RCA lead, i've tried two different leads.

The amplifier uses the 3 pin IEC power connector with ground. However, the DAC has an AC power brick which is a 2 pin plug IE no ground. Is this what's causing the noise? it's all i can think of.

My genius mate gaz got back to me and said "it could be because your USB is referenced higher than ground" which struck a chord because the USB input is from a pc that uses one of those picopsu things. Disconnected that, and it now works fine. Sorry for the needless thread, all

Just hope that a usb lead with the +/- VCCs disconnected fixes it

Last edited by Skree; 15th January 2016 at 05:35 PM. Reason: Problem solved
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Old 16th January 2016, 05:36 PM   #2
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Join Date: Apr 2004
You have a ground loop. What kind of PSU does the DAC use ? Is it a switchmode supply, or just a transformer ?

edit: Disconnecting the power connections from the USB port will not work. It is the ground connection, not the +V connection that is the problem, and you have to make a ground connection otherwise the data side of things will not work.

It's also possible that the AC power brick powering the picopsu is to blame. Is that a 2 pin AC connection too ? If so, it is likely that it's ground is floating at half mains potential. Find a 3 terminal (iec or "cloverleaf" mains input) supply to power the picopsu.

Last edited by jaycee; 16th January 2016 at 05:40 PM.
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