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Subwoofer hum


JohnW

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Now here’s interesting issue I can’t figure out.

 

I bought a never-used, still in the box, original Hsu Research VTF-2 Mk 1. I’d used one for fifteen years and loved it. Picked this one up for $100. It even still smelled new.

 

Anyway, plugged it in, everything was kosher. 
 

Until today. Turned on my receiver, which activated the sub, and there was a hum coming from it. Turned the receiver off, sub remained on, And kept humming.

 

Unplugged the rca cable (connecting the sub to the receiver), hum stopped. Tried a different rca cable, still had a hum.
 

Tried a different three-prong power cable, still had a hum.

 

Hmmm...

 

Tried a ground lifter. 

 

Hum gone. 
 

I’ve heard using a ground lifter Is a bad idea...but the previous sub used a two prong power cable....

 

Loose ground cable in the sub amp? 
 

Welcome to the boundaries of my knowledge.

 

Theories? Ideas?
 

 

 

 

 

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37 minutes ago, babadono said:

So you don't have a problem? This is double plus good.

You had a bad ground(shield) connection, you shook or wiggled something, broke through the dirt/corrosion or whatever and now all is good.

No, I attached a ground lifter to the AC plug. Not entirely crazy about that. 

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I’m trying to identify the possible cause of the hum, given that one day there was none, and the following day, there was. What commonly produces that sort of problem, Short of a change in devices in my house, of which there are none. 
 

Everything is plugged into a Belkin Pure AV PF-60 power conditioner. And that’s the real head scratcher.

Edited by JohnW
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