[hmen]

http://www.audioadvisor.com/prodinfo.asp?number=EBHUMX

Does anyone know if this works? Any other suggestions for getting rid of a ground loop?

[Big Red Machine]

I can reduce some noise but does not remove the hum totally.  Sell you one for $50!

[ted_b]

This has worked in my system to completely eliminate hum (not ground loop) from my center channel
http://www.zzounds.com/item--ARTDTI

This has worked too
http://www.xitel.com/USA/prod_gli.htm

[pbrstreetgang]

I have been eyeing this onehttp://www.jensen-transformers.com/ci2rr.html

[J Payton]

I have a Hum-x on each of my mono amps and they worked very well. I have a home theatre processor and and 2 channel pre in my system and had a nasty hum in my main speakers every time I turned on my home theatre processor. These did manage to take of the hum when nothing else reasonably priced did not.

[ted_b]

Although what really dropped the noise floor in my system to relative blackness, and reduced ground hum to nothing, is this whole house ground filter, installed at my mains
http://www.ep2000.com/Templates/ep2750.html

and this
http://www.ep2000.com/Templates/ep2050.html

[ted_b]

delete

[John Casler]

If it is caused by the bad grounding of your cable or sat (most of the time) this will help.

http://www.fadfusion.com/selection.php?product_item_number=20161000061



Be aware, that cable and sat ground loops can enter your system or any separate system in the house, even if they have NO connection except they are both plugged into your home grid.

To see if it is the cable/sat simply listen for the hum, then disconnect the cable/sat feed from the wall (unscrew coaxial).  If hum stops, that is the problem.

[richidoo]

Don't know about the Tru-Spec coax unit that John mentioned, it could be great quality for all I know. Just posting to mention that I bought the model offered by parts express for $9 and it broke after a few months. I replaced it with the Jensen coax unit, better construction and superior sound quality.

Thanks for the ground filters tip Ted, that looks good!

[GregC]

A few years ago I had a ground loop between my HT passthrough RCA connections (on a Musical Fidelity A-308 Integrated) and my HT processor.  I isolated the cause to be the RCA jacks on the A-308.  I used the following ground loop device with good results.

http://www.pmelectronix.com/product_info.php?products_id=17369

[pbrstreetgang]

Although what really dropped the noise floor in my system to relative blackness, and reduced ground hum to nothing, is this whole house ground filter, installed at my mains
http://www.ep2000.com/Templates/ep2750.html

and this
http://www.ep2000.com/Templates/ep2050.html

How much are these things and who would install them?

[ted_b]

Although what really dropped the noise floor in my system to relative blackness, and reduced ground hum to nothing, is this whole house ground filter, installed at my mains
http://www.ep2000.com/Templates/ep2750.html

and this
http://www.ep2000.com/Templates/ep2050.html

How much are these things and who would install them?

Send an email to Doug Joseph, EPNA President (and tell him I sent you    )
He will discuss $$.  He gave me quite a deal if i remember but can't find the receipts right now ($550-ish?).  I had my electrician install them.
Here's a review
http://www.enjoythemusic.com/Magazine/viewpoint/0606/aachapter80.htm

[John Casler]

Don't know about the Tru-Spec coax unit that John mentioned, it could be great quality for all I know. Just posting to mention that I bought the model offered by parts express for $9 and it broke after a few months. I replaced it with the Jensen coax unit, better construction and superior sound quality.

Thanks for the ground filters tip Ted, that looks good!

Hi Rich,

They are two different animals.

Xantech also makes one like the Tru-Spec.  They do not go in at line level.  They insert at the coax entry from the cable or dish which has bad grounding.

http://www.smarthome.com/81285/Xantech-Feed-Through-Surge-Protector-634-00/p.aspx


 
They are passive, so nothing to break unless you "cross thread the coax".

They only help if the "hum" is from bad grounding from the cable or sat dish.

They will not help if it is from some other grounding issue.  But the majority are due to the cable/sat even if the hum is in a totally separate system because once that "loop" is brought into and connected to ANY electrical outlet, the hum has the potential to infect anything in your house that is plugged into your electrical outlets.

[Brown]

If it is caused by the bad grounding of your cable or sat (most of the time) this will help.

http://www.fadfusion.com/selection.php?product_item_number=20161000061



Be aware, that cable and sat ground loops can enter your system or any separate system in the house, even if they have NO connection except they are both plugged into your home grid.

To see if it is the cable/sat simply listen for the hum, then disconnect the cable/sat feed from the wall (unscrew coaxial).  If hum stops, that is the problem.

Very helpfull and usefull info John. thank you. Never thought that my cable service was a culprit. After reading this, I checked my cable ground conn. Cleaned it, tightened it and removed from house ground to a rod in the ground. OMG I love you, well not that way, THANKS. No MORE HUM. None zero zippo.

[richidoo]

http://www.jensen-transformers.com/iso_vid.html
The Jensen I recommended is coaxial video for cable and FM antenna. It is capacitive, not magnetic isolation so doesn't screw up the digital channels on cable or sat.  I found the Jensen to sound noticably better than the transformer variety on FM radio, but it costs more, about $60.

Careful on the grounding Brown, you should only have one earth rod for your whole house. If you have a separate unbonded earthing rod (for a quiet stereo/cable ground) then lightning will find resistance between the two paths to earth and vaporize all the conductors between the two earth rods, some are inside the wall. Code allows only one earthing rod, and everything should be connected to it. Unfortunately this isn't the quietest ground possible hence all the gadgets to clean it up...    You can have multiple earthing rods for a lightning protection system, but they must be bonded together with wire big enough to carry the lightning current, so they are essentially the same potential anyway and just as noisy when cable TV is grounded to it.

[boead]

http://www.jensen-transformers.com/iso_vid.html
The Jensen I recommended is coaxial video for cable and FM antenna. It is capacitive, not magnetic isolation so doesn't screw up the digital channels on cable or sat.  I found the Jensen to sound noticably better than the transformer variety on FM radio, but it costs more, about $60.

Careful on the grounding Brown, you should only have one earth rod for your whole house. If you have a separate unbonded earthing rod (for a quiet stereo/cable ground) then lightning will find resistance between the two paths to earth and vaporize all the conductors between the two earth rods, some are inside the wall. Code allows only one earthing rod, and everything should be connected to it. Unfortunately this isn't the quietest ground possible hence all the gadgets to clean it up...    You can have multiple earthing rods for a lightning protection system, but they must be bonded together with wire big enough to carry the lightning current, so they are essentially the same potential anyway and just as noisy when cable TV is grounded to it.

I use that Jensen too for some time. It works great. Always solves ground loop from CTV.