Annoying hum from my ED A2-300

[CrazyInBlack]

When I first got it everything was great, and I was really impressed. But, recently it started humming when turned on. I have tried adjusting the gain and phase but nothing helps - besides turning the gain all the way down I have tried pulling out the plug that "splits" the feed cable and putting the cable into each plug separately, it does not help. Is my amp bad?

PS I have just emailed eD, so I will see what they say. I was just hoping someone on here has had the same issue and knows what the next step is.

Thanks Guys

[Big Daddy]

Originally Posted by CrazyInBlack

When I first got it everything was great, and I was really impressed. But, recently it started humming when turned on. I have tried adjusting the gain and phase but nothing helps - besides turning the gain all the way down I have tried pulling out the plug that "splits" the feed cable and putting the cable into each plug separately, it does not help. Is my amp bad?

PS I have just emailed eD, so I will see what they say. I was just hoping someone on here has had the same issue and knows what the next step is.

Thanks Guys

You may have a ground hum problem. Read Ground Hum & Ground Loop Isolators.

[CrazyInBlack]

thanks for the info. I went back there and tried to figure something out. I unplugged everything and rearranged some wires. I learned

1. when I unplug my tv - it gets a lot louder
2. it seems to change if people walk by it

what should I try next?

edit - unplugging the cable box and moving the router/cable box did nothing either

edit 2 - I am using a nice sub cable as well

[Big Daddy]

Originally Posted by CrazyInBlack

thanks for the info. I went back there and tried to figure something out. I unplugged everything and rearranged some wires. I learned

1. when I unplug my tv - it gets a lot louder
2. it seems to change if people walk by it

what should I try next?

edit - unplugging the cable box and moving the router/cable box did nothing either

Make sure you separate all the cables and wires. Try different wall outlets. Your last resort is to buy ground loop isolators for your sub and your computer/cable box. There are good ones listed in the link above.

[erict]

BD is correct as it sounds like a ground loop problem. I have one question though, you said everything has been fine up until now, did you do or add anything recently?

[CrazyInBlack]

Originally Posted by erict

BD is correct as it sounds like a ground loop problem. I have one question though, you said everything has been fine up until now, did you do or add anything recently?

Well, I moved. Set everything back up and it worked fine. The only thing I have added is a cable box. But, when it was unplugged nothing changed. I don't understand why when I unplug the TV it gets A LOT worse.

Can someone show me a link to a good surge protector and power conditioner? If Sears sells either it would be great since I get a discount there.

Also, I changed the plug with no success.

[erict]

Originally Posted by CrazyInBlack

Well, I moved. Set everything back up and it worked fine. The only thing I have added is a cable box. But, when it was unplugged nothing changed. I don't understand why when I unplug the TV it gets A LOT worse.

Can someone show me a link to a good surge protector and power conditioner? If Sears sells either it would be great since I get a discount there.

Also, I changed the plug with no success.

OK, everything was fine when you set everything back up after you're move, right? And the problem started when the cable box was hooked up, right? You said you unplugged the cable box but have you tried disconnecting the coax (IN) from the wall or box and see if the hum goes away?

[CrazyInBlack]

Originally Posted by erict

OK, everything was fine when you set everything back up after you're move, right? And the problem started when the cable box was hooked up, right? You said you unplugged the cable box but have you tried disconnecting the coax (IN) from the wall or box and see if the hum goes away?

ohhh, I thought it was coming in on the power side. ill try that

[VinnAY]

ungrounded cable TV is the #1 entry source for a ground loop.

[CrazyInBlack]

Originally Posted by erict

OK, everything was fine when you set everything back up after you're move, right? And the problem started when the cable box was hooked up, right? You said you unplugged the cable box but have you tried disconnecting the coax (IN) from the wall or box and see if the hum goes away?

ding ding ding, we have a winner. my cable comes from the floor into a splitter then into the box and modem. when I disconnected the feed from the splitter it went off. How do I fix it?

[erict]

Originally Posted by CrazyInBlack

ding ding ding, we have a winner. my cable comes from the floor into a splitter then into the box and modem. when I disconnected the feed from the splitter it went off. How do I fix it?

Check and make sure they grounded the coax coming into the house correctly or if there is even a ground. There should be a grounding block where the cable enters the house and that block should be grounded.

[CrazyInBlack]

I am chatting with them now, is this something I can do?

edit - he had me reset my box then to call back if it did not go away

[erict]

Originally Posted by CrazyInBlack

I am chatting with them now, is this something I can do?

edit - he had me reset my box then to call back if it did not go away

Resetting the box wont solve that issue. Can you do it yourself, sure if you know what to do and look for You can also have them come out and depending how knowledgeable the tech is he might be able to fix it. I'm sure it's not grounded correctly or not at all.

You should have something that looks like this where the coax enters the house.
http://www.crutchfield.com/p_6593274...k.html?tp=2636

[CrazyInBlack]

tech is coming out tomorrow

[erict]

Originally Posted by CrazyInBlack

tech is coming out tomorrow

Let us know the outcome

[CrazyInBlack]

he came this morning and my gf was there. he tried to say it was not his problem. Till she turned on the reciever and it started humming, then told him to unplug the cable. he went outside, came back in and said that it was grounded in the box. she said the noise is better, but still there

[Steve]

It sounds to me like he did a half-a$$ job of grounding it. Basically something to get her to shut up so he could leave. However, when you get home and are able to see what he did, you might be able to take further corrective action yourself and get the issue completely resolved.

[erict]

Originally Posted by CrazyInBlack

he came this morning and my gf was there. he tried to say it was not his problem. Till she turned on the reciever and it started humming, then told him to unplug the cable. he went outside, came back in and said that it was grounded in the box. she said the noise is better, but still there

Do you have a box right on the house or is this the box at the pole or in the yard? I wonder how they have it grounded or if it's grounded correctly. Do you have a ground block where the coax enters you're house like the link I posted yesterday?

[BrettBell_eD_Rep]

They can conceivably have the cable properly grounded to an earth ground and still have it introduce noise due to the difference in that earth ground and the one that the home would be connected to. Ground loops are tricky little things, and can even vary from season to season as the soil and moisture level changes allowing the voltage difference to present itself from grounding point to grounding point. And I shot the OP and email as well.

[aramis109]

Originally Posted by erict

Resetting the box wont solve that issue. Can you do it yourself, sure if you know what to do and look for You can also have them come out and depending how knowledgeable the tech is he might be able to fix it. I'm sure it's not grounded correctly or not at all.

You should have something that looks like this where the coax enters the house.
http://www.crutchfield.com/p_6593274...k.html?tp=2636

Just curious on that Crutchfield link- don't you have to actually attach or ground that to something? I am 90% sure my cable's already grounded, and I don't have a hum, but I was curious as I know it affects a lot of folks.