I replaced all electrolytics in subwoofer, still get a hum in speakers - audio clip

[Delicieuxz]

I get a faint, low hum through my PC speakers, which connect to the subwoofer in a 2.1 speaker system. The hum drives me crazy and makes me stressed. When I turn off the subwoofer, everything is quiet and I start to relax, lol.

Here's an audio clip of the sound coming from my speakers:

https://vocaroo.com/16HaryHwTx78

I recorded with my phone's mic right next to the speaker, and the mic picked up a lot of speaker noise over top of the hum. But I don't hear that noise in the room, I just hear the lower-pitched hum that's buried beneath all the other noise. I boosted the volume of the clip by 20db before uploading it, but you may still need to turn-up the volume to hear the hum.

At 12 seconds into the clip, I turn-off the speaker system with a button that's on the subwoofer. Then all the noise and hum goes quiet. I turn the speaker system on again at around 15 seconds into the clip.


I recently replaced all the electrolytics in this subwoofer, per this thread I made about it here (photos of the board are there):

https://www.badcaps.net/forum/showpo...82&postcount=6

I'm wondering if there's something more I can do to get rid of that hum. If there isn't, maybe I just need to buy a new speaker system. Though, I really like this one, I think it sounds excellent. But that constant hum makes me feel stressed.

[прямо]

Re: I replaced all electrolytics in subwoofer, still get a hum in speakers - audio cl

The hum is a clear indicator that you have a grounding problem most likely a ground loop. The speaker noise is also higher than normal for a 2.1 PC speaker system for your phone mic to be able to pick it up.

Usually it's because the outlet you're powering the speaker or the computer from is sharing with another appliance(s) with a grounding issue. Try turning them off one by one and check if the noise and hum disappear from your speaker.

[madan1]

Have you tried other audio signal source? What about shorting the signal input to ground?

p.s. Download spectrum analyzer app and see what frequency is the hum - is it 50/60hz, 100/120hz.. ?