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umik-1 701-9851 1khz probleme 2 years 1 day ago #49621

  • jycy
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Hello
I am French, and I want to apologize for my approximate English (google translation)

Hello
my umik-1, generates a noise at 1khz with harmonics.
I first thought of a computer problem.
I plug it into another computer, same phenomenon.
If I open the back of the microphone, the problem disappears.
So I think of a mass problem, but the measurement to the ohm indicates that the mass is corrected.
I came across a very old topic:
www.minidsp.com/forum/umik-questions/867...design-or-faulty-mic
But this problem was on a version earlier than mine.
Here is a screenshot.
What do you think ? Do I have a problem? or all umik-1 have behavior
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Last edit: by jycy.

umik-1 701-9851 1khz probleme 1 year 11 months ago #50040

  • djj
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Hi there,

I am experiencing the same problem.
I have a pair of UMIKs, from different generations. The one with a 705-xxxx serial # has particularly bad, audible harmonics @ 1kHz. It is amplified when using a particular long (3m) USB cable. This makes me wonder whether it's something to do with the voltage drop from longer cables.

The second, with a 702-xxxx serial, is less problematic, but if I use it with a longer cable, I again get a low level of harmonics. See plot below.

Both of them seem to have a similar high broad-band noise floor.

Any input on this appreciated. I'm assuming that the noisy mic may be from a faulty batch?
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Last edit: by djj.

umik-1 701-9851 1khz probleme 1 year 9 months ago #50813

  • dedeffa
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same problem here serial 706-4822. have returned it to get a replacement.

I'm aware of others on forums who have this same issue with newer mics.

sad that's there's been no response to this thread...

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umik-1 701-9851 1khz probleme 1 year 8 months ago #51322

  • TimoJ
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I think it's a grounding problem of the microphone's top cap. Looks like it's a manufacturing error.

Try this: hold the mic inside your hand and put your thumb on the top piece that houses the microphone capsule, with my UMIK-1 the 1KHz tone completely disappears.

And then I "fixed" the problem by putting a sharp knife into the top cap/main body seam and rolled the mic so that that the top cap moved little (less than 1mm) upwards. I think this caused top cap-main body grounding to make better contact. No more 1KHz tones after that. I put a piece of kapton tape over the seam.


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Last edit: by TimoJ.
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