Intermittent buzzing on Topping L30/E30 setup

[Dunring]

Wi-Fi is already on 5ghz. You think 2.4ghz might work? The noise comes from some mobile network activity i think. Like the amp picks up phone calls like it's designed to do that.

2.4ghz won't fix it. GSM and CDMA run at 800mhz, 850MHz, and 1900MHz if it's your mobile signal that's setting it off. You have to shield it unless it's your cable connectors that's picking it up. If you have a different set of cables with well shielded connectors, about the only easy solution. If it's a stack maybe put the amp or the DAC on top to see if one can shield the other that's getting the interference. These are the beefy 12 gauge RCA's I use and never had any interference with them (or felt I overpaid).

 

[Taschenrechner]

Possibly some ferrites or a small inductor close to the headphone connector could have prevented this.
Looks like RF can make it into the feedback loop.
I would expect this would have been spotted in standard EMC testing.
How close does the RF source have to be for this to occur ?

i have to always set my phone on the very far end of my work desk to avoid interference it starts at arround 50cm. The closer the phone the louder the signal pickup.

 

[Taschenrechner]

2.4ghz won't fix it. GSM and CDMA run at 800mhz, 850MHz, and 1900MHz if it's your mobile signal that's setting it off. You have to shield it unless it's your cable connectors that's picking it up. If you have a different set of cables with well shielded connectors, about the only easy solution. If it's a stack maybe put the amp or the DAC on top to see if one can shield the other that's getting the interference. These are the beefy 12 gauge RCA's I use and never had any interference with them (or felt I overpaid).

I already tried diffrent propper shielded cables. It really does nothing. Same with just plugging in only headphones in (no input/dac).

I actually have the dac under my desk. I could put the dac on top but it would ruin the ergonomics of my setup.

I wonder if I could build some sort of Faraday cage around it. Or if ferrite rings at the input/output might help.

Seems overkill and also I really can't accept a hi-fi product over looked this pretty glaring issue.

 

[Taschenrechner]

Here is a video of the whole thing:

 

[Dunring]

This is the monitor riser I use to give an idea how a 15" one fits. You could easily put Faraday cloth over it which may help. The other one we have is made of metal with vent holes, but I don't know if it would do enough to shield it with the holes in it. I have an original L30 around here and that's never picked anything up. The one there has removable feet so you can adjust it way down low with just 1-2 pegs in it.