Subwoofer hum

[R!zz0]

Hello fellows, i tried pretty much everything to get rid of the hum/buzz on my subwoofer.
I even tried "ground loop isolator" and disconnected every single component to see if i can stop the hum.
Nothing worked and i am out of ideas. A Friend of mine told me to get a "noise filtering" surge protector.
Any ideas on "noise filtering" surge protector? Have you used it? Do you have it? Will it work?

Cheers.

 

[Irvrobinson]

What brand and model is the sub? What is it connected to?

 

[lovinthehd]

What sub and what is everything you tried? Is it a 60hz hum or is it some other kind of noise? Don't waste money on a noise filtering surge protector....

 

[R!zz0]

It's a Polk PSW111 and it's connected to Yamaha RX-V781 receiver.

 

[Speedskater]

Have you tried it with the sub and receiver plugged into the same AC outlet?
Have you tried it with all the input cables to the receiver disconnected?

 

[R!zz0]

"Have you tried it with the sub and receiver plugged into the same AC outlet?" Yes

"Have you tried it with all the input cables to the receiver disconnected?" No

I'll have to try that.

 

[TLS Guy]

"Have you tried it with the sub and receiver plugged into the same AC outlet?" Yes

"Have you tried it with all the input cables to the receiver disconnected?" No

I'll have to try that.

If the sub hums when nothing is connected to it, then the subs power supply has failed. If it only hums when connected to the receiver then you have a ground loop and we have to help you track it down.

 

[massacre]

I had this problem it was fro rg6 to the cable box. I ran it to a monster power supply and filter.
after that no noise. check your box on the house for a good ground also.

 

[R!zz0]

Okay i took all other components out from behind the receiver (hdmi) and still had the hum.

The hum stays on after i stop playing songs from "musiccast"

 

[TLS Guy]

Okay i took all other components out from behind the receiver (hdmi) and still had the hum.

The hum stays on after i stop playing songs from "musiccast"

Yes, but what is crucial is to know if the sub hums when you pull the input cable from the receiver at the sub end. If it hums then that sub is done, and you need a new and better one.

 

[R!zz0]

No it doesn't hum when i pull the input cable from the receiver.

 

[TLS Guy]

No it doesn't hum when i pull the input cable from the receiver.

Then there is a ground loop between the receiver and the sub.

You say it hums with the sub connected to the receiver even when everything is disconnected from the receiver. Does that include Internet cables and anything connected to a cable or satellite system?

Now does the receiver and or the sub have a three pin AC plug or just two?

 

[R!zz0]

"Does that include Internet cables and anything connected to a cable or satellite system?" Yes

Both the receiver and the sub have a 2 pin plug.

 

[TLS Guy]

"Does that include Internet cables and anything connected to a cable or satellite system?" Yes

Both the receiver and the sub have a 2 pin plug.

Well that is really strange.

Possibly something has an internal ground loop.

Try bonding the chassis of the sub and receiver with a heavy gauge cable.

Also get an outlet tester from Home Depot and make sure that one of the receptacles does not have live and neutral reversed.

The other possibility is that your neutral and grounds are not properly bonded at your panel.

You might need the help of an electrician to do an inspection and run some tests.

 

[highfigh]

An easy way to bond the chassis of the AVR and sub is to connect a wire from the sub's RCA plug at the AVR to the ground screw, then connect a wire from the RCA plug at the other end to the lock nut on one of the controls on the sub- it will be easier if you have a second person for this. If the hum stops, find a way to make this connection permanent.

The other way is by using an isolation transformer- these can be bought from Jensen Transformers (the most expensive, but arguably the best),Ebtech, Edcor and others.

The first step is to find out how much voltage you can measure between the AVR and sub. If this is caused by an electrical problem (reversed hot & neutral, resistance on the neutral or hot, etc), that should be addressed, rather than using some kind of band aid- those should be the first on the list because they're safety risks.

 

[Trell]

OP posted the thread October 2017, just saying.