Wiim ultra causing hum

[jdjd1]

Hello, I have a hum on my active subwoofer (arendal 1961 1s) with wiim ultra "sub out", I have put everything on the same grounded main for testing, the main where the extension is connected normally is ungrounded.

Everything was always connected to same main (ungrounded/grounded) via a protected belking extension. I turned off every device in the living room as well as disconnected each cable from wiim ultra one by one, until I narrowed the problem.

The wiim sub out alone with nothing else connected to wiim or subwoofer makes the subwoofer hum, if it is connected either by 12v trigger or rca's (line out) to amp (AUDIOPHONICS AP300-S250NC Power Amplifier Ncore NC252MP) the hum worsens ALOT, if I remove amp the hum is reduced alot, however still present with sub out being used, and if wiim ultra is connected via line out to sub it is lower than using sub out (subwoofer has choice for 1 input or 2 input), if I remove the wiim from subwoofer the subwoofer goes absolutely silent, not even a hint of a hum at maximum gain, so the problem here is the wiim ultra. The wiim connected to AMP and main speakers run absolutely dead silent. So the wiim ultra only causes issues with the subwoofer (probably because the amp blocks any and all noise to speakers).

Is this a cracked wiim ultra sub out, is it the board, is it wiim ultra ground? I don't know why Wiim ultra is producing the hum at the subwoofer, however if I connect anything to subwoofer other than the wiim ultra it remains dead silent.

Should I go to seller and ask for a wiim replacement and see if it doesn't do this?

I spent hours trying several connection ways, different outlets, cables, everything possible mentioned online.

I did narrow it to the wiim ultra, since the main speakers don't produce hum and neither does the subwoofer if the wiim ultra isn't in the chain.

Any help would be welcome.

PS: I disconnected (tested multiple times) ethernet cable from wiim ultra as well to see if it was the culprit in between testing things.
PS2: it is a ground loop as the hum frequency is 50hz 100hz 150hz and so on. However it is the wiim ultra that causes it/can't handle it.

Best regards,
JD

 

[jdjd1]

Could something like a DYNAVOX X4100 HiFi Filter 8 Schuko Black fix the issue?

Or a
IFI AUDIO GND DEFENDER Main Power Supply Ground Loop Filter 90-240VAC
Connected to sub or amp?

 

[hgo58]

Hello, I have a hum on my active subwoofer (arendal 1961 1s) with wiim ultra "sub out", I have put everything on the same grounded main for testing, the main where the extension is connected normally is ungrounded.

Everything was always connected to same main (ungrounded/grounded) via a protected belking extension. I turned off every device in the living room as well as disconnected each cable from wiim ultra one by one, until I narrowed the problem.

The wiim sub out alone with nothing else connected to wiim or subwoofer makes the subwoofer hum, if it is connected either by 12v trigger or rca's (line out) to amp (AUDIOPHONICS AP300-S250NC Power Amplifier Ncore NC252MP) the hum worsens ALOT, if I remove amp the hum is reduced alot, however still present with sub out being used, and if wiim ultra is connected via line out to sub it is lower than using sub out (subwoofer has choice for 1 input or 2 input), if I remove the wiim from subwoofer the subwoofer goes absolutely silent, not even a hint of a hum at maximum gain, so the problem here is the wiim ultra. The wiim connected to AMP and main speakers run absolutely dead silent. So the wiim ultra only causes issues with the subwoofer (probably because the amp blocks any and all noise to speakers).

Is this a cracked wiim ultra sub out, is it the board, is it wiim ultra ground? I don't know why Wiim ultra is producing the hum at the subwoofer, however if I connect anything to subwoofer other than the wiim ultra it remains dead silent.

Should I go to seller and ask for a wiim replacement and see if it doesn't do this?

I spent hours trying several connection ways, different outlets, cables, everything possible mentioned online.

I did narrow it to the wiim ultra, since the main speakers don't produce hum and neither does the subwoofer if the wiim ultra isn't in the chain.

Any help would be welcome.

PS: I disconnected (tested multiple times) ethernet cable from wiim ultra as well to see if it was the culprit in between testing things.
PS2: it is a ground loop as the hum frequency is 50hz 100hz 150hz and so on. However it is the wiim ultra that causes it/can't handle it.

Best regards,
JD

Did you try different RCA cables?

It could be a bad cable.

 

[slartibartfast]

Hello, I have a hum on my active subwoofer (arendal 1961 1s) with wiim ultra "sub out", I have put everything on the same grounded main for testing, the main where the extension is connected normally is ungrounded.

Everything was always connected to same main (ungrounded/grounded) via a protected belking extension. I turned off every device in the living room as well as disconnected each cable from wiim ultra one by one, until I narrowed the problem.

The wiim sub out alone with nothing else connected to wiim or subwoofer makes the subwoofer hum, if it is connected either by 12v trigger or rca's (line out) to amp (AUDIOPHONICS AP300-S250NC Power Amplifier Ncore NC252MP) the hum worsens ALOT, if I remove amp the hum is reduced alot, however still present with sub out being used, and if wiim ultra is connected via line out to sub it is lower than using sub out (subwoofer has choice for 1 input or 2 input), if I remove the wiim from subwoofer the subwoofer goes absolutely silent, not even a hint of a hum at maximum gain, so the problem here is the wiim ultra. The wiim connected to AMP and main speakers run absolutely dead silent. So the wiim ultra only causes issues with the subwoofer (probably because the amp blocks any and all noise to speakers).

Is this a cracked wiim ultra sub out, is it the board, is it wiim ultra ground? I don't know why Wiim ultra is producing the hum at the subwoofer, however if I connect anything to subwoofer other than the wiim ultra it remains dead silent.

Should I go to seller and ask for a wiim replacement and see if it doesn't do this?

I spent hours trying several connection ways, different outlets, cables, everything possible mentioned online.

I did narrow it to the wiim ultra, since the main speakers don't produce hum and neither does the subwoofer if the wiim ultra isn't in the chain.

Any help would be welcome.

PS: I disconnected (tested multiple times) ethernet cable from wiim ultra as well to see if it was the culprit in between testing things.
PS2: it is a ground loop as the hum frequency is 50hz 100hz 150hz and so on. However it is the wiim ultra that causes it/can't handle it.

Best regards,
JD

How long is your subwoofer cable and is it coiled up?

 

[pjorgenunes]

Do you use trigger out in the ULTRA and an USB DAC?

 

[jdjd1]

Did you try different RCA cables?

It could be a bad cable.

Multiple cables, multiple lengths, multiple ways.

 

[jdjd1]

Do you use trigger out in the ULTRA and an USB DAC?

No the 12v trigger is used for the amp, no USB, or usb dac. As stated above I went until it was only wiim plus sub out and wiim plus line out. No other connections or devices in the extension connected to an ungrounded as well as tested with a grounded main. Wiim causes subwoofer to hum.

 

[jdjd1]

How long is your subwoofer cable and is it coiled up?

I even tried with 70 cm cable. Completely flat away from any electrical component.

 

[jdjd1]

Ok, so now what I did to test was Y split (rca male to 2 female) left line output of wiim ultra and Y split (rca male to 2 female) right line output to amp (left1 to left and right1 to right) and subwoofer (left2 to left and right2 to right) and the hum is barely audible, only if I crank max gain on subwoofer (subwoofer amp) I can hear something, and this is even with 12v trigger of wiim ultra connected to AMP.

So only when wiim ultra sub out is connected to subwoofer do I get issues.

On grounded main. And now also on ungrounded main.

Also tested with a different extension, a normal 3 socket extender, only when sub out is connect to subwoofer do I have audible issues.

 

[jdjd1]

Also tested focusrite connected from output 2 Y split to one channel in amp and 1 channel in subwoofer, slightly audible (ear near) at max gain.

 

[jdjd1]

So I reduced sub gain to -3 and will use subout at +15 then the hum is lower. Livable I guess.

 

[jed1]

Have you tried connect Ultra's phone ground to main power's ground?

 

[jdjd1]

Have you tried connect Ultra's phone ground to main power's ground?

No I guess, how would I do that?

 

[jed1]

You can run a wire between phone ground connector (that comes with WiiM Ultra) and main power's ground pin (for example, if there is an empty socket on the power strip, you can stick in the wire to the ground pin hole). You amp and sub have three prong power plug while Ultra has a two-prong plug. I believe that causes a ground loop even with shared main power.