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Ground loop on speakers

G

Goi

Diamond Member
Hi,

I just bought myself a new pair of HiVi M10 speakers, and they sound awesome. Problem is, once they're warmed up, a very audible low frequency hum(I'm assuming it's ~60Hz) is emitted. It doesn't happen when it's just switched on, at least, I don't hear it, but I hear it after a few minutes.

The volume of the hum is independent of the speaker volume knob, and even when I disconnect the audio cable from my PC, it's still there.

I'm assuming it's a ground loop. How do I get rid of it? My speakers, monitor, and PC PSU are all connected to an extension cord.

Thanks.
 
I've also noticed that the sub gets kinda hot after some time even when nothing is playing. Most sub amps are Class D, so that can't be normal right?
 
DI box or ground lift is not going to cure non ground loop related problems.
Since you're experiencing hum with nothing connected this points to a hardware defect - excessive AC ripple entering the amplifier stage. It's possible as well if the unit is insufficiently shielded, using a high gain stage and placed near a strong AC field. Try moving the speakers to another part of the room to see if the hum abates.

If not, get them swapped out.
 
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