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Ground Loop Hum still persists...Suggestions?
I know this topic has been covered but this problem is getting annoying.
Here is some background info:
I recently upgraded a very old sub (no hum) and replaced it with eD's A3-300. The same outlet is being used as with the old sub. Sub is plugged into a different outlet than the rest of the AV equipment.
Initially I was having difficulty with power to the sub, so I bought a y-splitter. Now the minute the AVR or TV is on, the sub fires up.
Hum is audible, when crossover is all the way up and volume on the sub is anything over 1/4. I don't want to adjust the crossover setting, but I have also noticed that with the volume 1/2 way up, hum starts when crossover is anything beyond 1/2 way.
-I have disconnected my ATT U-verse coax.....no change. Tried fooling around with power supply as well and also no change.
-I ran an extension cord from the sub to two different outlets...no change
-I did install a ground loop isolator from radio shack and plugged it into the AVR....Sound gone!! ....It may be me, but there seemed to be a huge decrease in performance. Also, after placing the isolator, the sub would not turn on at times.
I have heard of cheater plugs, but many say to avoid these things.
Any suggestions?
Also the hum is also audible from my speakers when I get real close to them.
Thanks
Here is some background info:
I recently upgraded a very old sub (no hum) and replaced it with eD's A3-300. The same outlet is being used as with the old sub. Sub is plugged into a different outlet than the rest of the AV equipment.
Initially I was having difficulty with power to the sub, so I bought a y-splitter. Now the minute the AVR or TV is on, the sub fires up.
Hum is audible, when crossover is all the way up and volume on the sub is anything over 1/4. I don't want to adjust the crossover setting, but I have also noticed that with the volume 1/2 way up, hum starts when crossover is anything beyond 1/2 way.
-I have disconnected my ATT U-verse coax.....no change. Tried fooling around with power supply as well and also no change.
-I ran an extension cord from the sub to two different outlets...no change
-I did install a ground loop isolator from radio shack and plugged it into the AVR....Sound gone!! ....It may be me, but there seemed to be a huge decrease in performance. Also, after placing the isolator, the sub would not turn on at times.
I have heard of cheater plugs, but many say to avoid these things.
Any suggestions?
Also the hum is also audible from my speakers when I get real close to them.
Thanks
1 - 14 of 14 Posts
onkyo 605
Cheater plug IMO.
It may carry a slight risk, but there is zero performance hit. And it's dirt cheap.
It may carry a slight risk, but there is zero performance hit. And it's dirt cheap.
Did you call ED? They may be able to help you!
Or purchase one of these. You can find them cheaper on ebay.
http://www.ebtechaudio.com/humxdes.html
Quote:
Originally Posted by Noubourne /forum/post/16895085
Cheater plug IMO.
It may carry a slight risk, but there is zero performance hit. And it's dirt cheap.
Or purchase one of these. You can find them cheaper on ebay.
http://www.ebtechaudio.com/humxdes.html
http://www.avsforum.com/avs-vb/showthread.php?t=322698
It's most likely a ground loop due to the electrical ground of your CATV system being different than the electrical ground of your electrical system. Unplug your cable box and see if it goes away. If it does, that is likely the problem. If so, there are a couple of ways to correct the problem, (see the above link). Cheater plugs are the least attractive solution.
Craig
It's most likely a ground loop due to the electrical ground of your CATV system being different than the electrical ground of your electrical system. Unplug your cable box and see if it goes away. If it does, that is likely the problem. If so, there are a couple of ways to correct the problem, (see the above link). Cheater plugs are the least attractive solution.
Craig
Thanks but as I mentioned in my original post, I tried disconnected the coax of the cable feed and problem still existed.
Ebtech's Hum-X is running around $60 and I can get a cheater plug for $5.
Quote:
Originally Posted by craig john /forum/post/16895501
http://www.avsforum.com/avs-vb/showthread.php?t=322698
It's most likely a ground loop due to the electrical ground of your CATV system being different than the electrical ground of your electrical system. Unplug your cable box and see if it goes away. If it does, that is likely the problem. If so, there are a couple of ways to correct the problem, (see the above link). Cheater plugs are the least attractive solution.
Craig
Thanks but as I mentioned in my original post, I tried disconnected the coax of the cable feed and problem still existed.
Ebtech's Hum-X is running around $60 and I can get a cheater plug for $5.
True, but with a cheater plug you totally omit you're ground were as the hum-x still keeps you're equipment grounded. You're call
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Quote:
Originally Posted by salraf /forum/post/16898756
Thanks but as I mentioned in my original post, I tried disconnected the coax of the cable feed and problem still existed.
Ebtech's Hum-X is running around $60 and I can get a cheater plug for $5.
True, but with a cheater plug you totally omit you're ground were as the hum-x still keeps you're equipment grounded. You're call
the grounds there for safety... don't lift it.
It ain't called a "cheater" plug for nuthin'. Find the *real* cause of your problem and address it. Anything less is "cheating".
BTW, do you have more than one cable box?
Quote:
Originally Posted by salraf /forum/post/16898756
Thanks but as I mentioned in my original post, I tried disconnected the coax of the cable feed and problem still existed.
Ebtech's Hum-X is running around $60 and I can get a cheater plug for $5.
It ain't called a "cheater" plug for nuthin'. Find the *real* cause of your problem and address it. Anything less is "cheating".
BTW, do you have more than one cable box?
Surprisingly, I don't know if this is a ground loop hum, but I moved my mini fridge to a different outlet in the room, still on the opposite side of the room. When the compressor kicks in, the sub and speakers hum. All I had to do to fix it was move it back to the previous plug in. Not sure if the OP's system has something like that, but maybe this experience can help.
Fixing the issue means adding an appropriate path to ground as opposed to having stray current go through the sud on its way to ground. Lift the ground on the sub, and the stray current will try to find another path to ground, at the one it finds may not be to your liking.
Make sure the sub outlet, and the outlets anything else is plugged into are well grounded to the same ground. Unplug everything and add devices back one at a time and see which one or ones add the hum. Fix them.
Make sure the sub outlet, and the outlets anything else is plugged into are well grounded to the same ground. Unplug everything and add devices back one at a time and see which one or ones add the hum. Fix them.
There is a second cable box in the upstairs bedroom.
Quote:
Originally Posted by craig john /forum/post/16898982
It ain't called a "cheater" plug for nuthin'. Find the *real* cause of your problem and address it. Anything less is "cheating".
BTW, do you have more than one cable box?
There is a second cable box in the upstairs bedroom.
1 - 14 of 14 Posts
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