Ground loop issue - AVS | Home Theater Discussions And Reviews
Speakers > Ground loop issue
shelly40's Avatar shelly40 10:12 AM 10-13-2013
When my system is set at minimum volume, there is
hissing/buzzing sound coming from all of the tweeters
in my system....

This doesn't seem very good for the tweeters...

I'm thinking it is a ground loop problem...

So I try one of those "cheater plugs"..

It seems to have greatly diminished the noise coming
from the tweeters....

What are the downfalls of using the cheater plug ?

Can anything bad happen ?

Or is it fine to just keep using it ?

Thanks

Shelly

coytee's Avatar coytee 10:23 AM 10-13-2013

Try a grounding plug on the input of each channel.

 

Take a RCA line, cut/twist the ends together so the +/- are together.  Plug into the input and then listen.

 

My understanding is this process will negate everything and let you know what the base level noise of your unit is.

 

Are you using highly sensitive speakers?  Sounds like you might have (at least) a horn tweeter?


losservatore's Avatar losservatore 10:28 AM 10-13-2013
Check if this help

Before doing this unplug anything from that outlet and use a lamp to make sure that you are turning off the right outlet , go to the breaker panel and turn the breaker of that outlet off and then back on.
Espo77's Avatar Espo77 08:04 PM 10-13-2013
Quote:
Originally Posted by shelly40 View Post

When my system is set at minimum volume, there is
hissing/buzzing sound coming from all of the tweeters
in my system....

This doesn't seem very good for the tweeters...

I'm thinking it is a ground loop problem...

So I try one of those "cheater plugs"..

It seems to have greatly diminished the noise coming
from the tweeters....

What are the downfalls of using the cheater plug ?

Can anything bad happen ?

Or is it fine to just keep using it ?

Thanks

Shelly

If you hear a buzz or hissing sound, it's probably not a ground loop, because a ground loop makes a "humming" sound. The buzz or hissing noise is probably RF noise. Keep your A/C lines separated away from your other cables behind the equipment rack. If they must touch each other, do so at a 90 degree angle.
Bill Fitzmaurice's Avatar Bill Fitzmaurice 06:33 AM 10-14-2013
Quote:
Originally Posted by shelly40 View Post


What are the downfalls of using the cheater plug ?

Can anything bad happen ?
Worst case? Electrocution. eek.gif
The cause of ground loops is unbalanced connections:
http://www.rane.com/note110.html

To find what's causing it start with nothing plugged into the AVR, then plug in components one at a time. Transformer isolation of the interconnect is one cure. The usual culprits are powered subs and the TV cable.
But ground loops cause low frequency hum, not high frequency noise. High frequency noise is usually caused by dimmers and flourescent lights.
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