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Author Topic: A question about low frequency hum.  (Read 78 times)

Darathu

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A question about low frequency hum.
« on: June 18, 2021, 10:50:37 pm »

Hello, I am new to these forums, to be blunt I have noticed that there are many intelligent people on these forums and I am wondering if someone recognizes a situation I'm confronting and has any input or a solution for it.

So what's happening is that, I have a low frequency hum on both channels of my headphones, my headphones are Hifiman He400Se rated for about 25 ohm(may be related) and the hum is present whenever I connect them to my PC or when I touch the jack on my metallic keyboard or on my midi keyboard connector, the hum is there regardless of connector and I can even get the hum by touching the ground pins on my extender cable with the headphone jack.

The hum goes away when I touch any exposed metal surface in the circuit, so like my metallic keyboard, the exposed parts of any jack, the ground pins in my extender.

Here's the kicker, I don't have a connection to ground at all. All devices are plugged into one outlet, if I remove all devices and just touch the headphone jack on the ground pin of the extender I get the hum, I guess I haven't yet tried to change extenders, the one I have now has a light bulb, I will try to change that as well in the future, but guys, does this ring any sort of bells?
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Mac Kerr

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« Reply #1 on: June 18, 2021, 11:34:51 pm »

Hello, I am new to these forums, to be blunt

Please go to your profile and change the "Name" field to your real first and last name as required by the posting rules displayed in the header at the top of the section, and in the Site Rules and Suggestions in the Forum Announcements section, and on the registration page when you registered.

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« Reply #1 on: June 18, 2021, 11:34:51 pm »


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