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John DarbyFlag for United States of America

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Computer sound system makes humming sound

Greetings, I have a Behringer U-Phoria UMC22 driving two Yamaha HS50M speakers. I can't seem to eliminate the humming noise. Suggestions?
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Gerwin Jansen
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Are they powered speakers? The Behringer is only connected using USB? I would say check power cables / ground connection.
Many PC mainboards are badly built & produce noise that can also be passed on to sound systems. The high frequencies used are a reason for that, & if there isn't anything done to avoid this or the parts are placed too close to the to the sensitive parts, you get these effects.

Maybe check this with other PC's to see if you get similar effects, & as mentioned above Grounding, particularly of the PC, is very important.
When do you hear the humming?
When you have a microphone or instrument plugged into it, or when you are playing back audio from the computer?
The reason I ask this is because it could be that your instrument (particularly electric or electro-acoustic guitar), or an instrument amplifier (even if using a line-out to the audio interface), could easily be introducing hum of its own when plugged in.

Do you hear humming through headpones plugged into the front of your unit?

The unit has a "direct monitoring" button on the front.  This is designed so that your input doesn't have to pass all the way through the computer as would be the case if you were connecting an input to the computer's own sound card.  That causes latency (delays).  Direct monitoring bypasses this so you don't have latency when monitoring the input.  Is there any difference to the humming when you press the Direct Monitoring button?

Any electronic device produces an electro-magnetic field.  Neon lighting tubes, power supply adapters, guitar amplifiers, your computer, other powered speakers, etc, etc.  My first thoughts would be to try and reposition all your component parts while you are hearing the hum to see whether the hum becomes quieter or goes below your hearing threshold.  If they cannot be placed too far from each other, try placing a metal baking tray between the components in turn as a shield to see whether the humming lessens.  Try plugging the power supply for your speakers into a different socket from the computer.



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Lots of great input; let me do some spacing and shielding to see if hum is reduced. I suspect it’s the Alienware monitor
the most common causes for hum are bad grounding, poor shielding or bad connections,  i'd say !so first check proper grounding, and test with other cables i'd say.
I found an interesting pattern: when the CPU is under increasing load, the hum increases. I will try increasing distance between computer/tower and the sound system. Thanks!
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Gerwin Jansen
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Thank you, each for your insights!
You’re welcome @john