Hum Fixed - Advice on Method

[Snarl]

I have a Denon AVR-3805 Receiver, the power cord "does not" have a Ground Pin on the Plug. The power chord on the Outlaw Amp "does" have a Ground Pin on the Plug. These are both plugged into the same circuit/Outlet and my CD Player and DVD Player are pluged into the Denon.

I have had a very slight Hum that can be heard on my speakers from -79dB to +18dB on the volume control, it does not get any louder as you turn up the volume and is basically inaudible when music/ht is playing however it still bugs me. I know this is a Ground loop issue and have fixed it by running a ground wire from a screw in the Denon's Chassis to a screw in the Outlaw's Chassis.

My question is.. Can I hurt anything with this repair ? it has completely removed the Hum and every thing "seems" fine, the mechaninc in me says everything should be okay and there should be no issues however I know enough to know I don't know enough if you get my drift . Can anyone advise of any possible dangers/concerns with this approach ? any similar experiences ?

Thank You

 

[3db]

Good job

I have a Denon AVR-3805 Receiver, the power cord "does not" have a Ground Pin on the Plug. The power chord on the Outlaw Amp "does" have a Ground Pin on the Plug. These are both plugged into the same circuit/Outlet and my CD Player and DVD Player are pluged into the Denon.

I have had a very slight Hum that can be heard on my speakers from -79dB to +18dB on the volume control, it does not get any louder as you turn up the volume and is basically inaudible when music/ht is playing however it still bugs me. I know this is a Ground loop issue and have fixed it by running a ground wire from a screw in the Denon's Chassis to a screw in the Outlaw's Chassis.

My question is.. Can I hurt anything with this repair ? it has completely removed the Hum and every thing "seems" fine, the mechaninc in me says everything should be okay and there should be no issues however I know enough to know I don't know enough if you get my drift . Can anyone advise of any possible dangers/concerns with this approach ? any similar experiences ?

Thank You

Nope. Its A OK what you did. By doing what you did, you brought both chassis to the same ground point. Good job.

 

[ht_addict]

I have a Denon AVR-3805 Receiver, the power cord "does not" have a Ground Pin on the Plug. The power chord on the Outlaw Amp "does" have a Ground Pin on the Plug. These are both plugged into the same circuit/Outlet and my CD Player and DVD Player are pluged into the Denon.

I have had a very slight Hum that can be heard on my speakers from -79dB to +18dB on the volume control, it does not get any louder as you turn up the volume and is basically inaudible when music/ht is playing however it still bugs me. I know this is a Ground loop issue and have fixed it by running a ground wire from a screw in the Denon's Chassis to a screw in the Outlaw's Chassis.

My question is.. Can I hurt anything with this repair ? it has completely removed the Hum and every thing "seems" fine, the mechaninc in me says everything should be okay and there should be no issues however I know enough to know I don't know enough if you get my drift . Can anyone advise of any possible dangers/concerns with this approach ? any similar experiences ?

Thank You

Can you here the hum from the seating position or do you have too put your ear to the speakers tweeter? It maybe just the hum from the transformer in the Outlaw that your hearing. Goto your local electronics shop and pickup a cheater plug and try that too see if the hum disappears. If you have a cable box or sat box disconnect the cable connecting them to your tv and see if the hum disappears. I couldn't answer your question as I'm not an electrician, but both units have different grounding schemes, so lets say the amp has a grounding fault and you've wired it too the Denon, now the casing off the Denon would be live and anyone touching it could be in for a shock(I think)

 

[Snarl]

Can you here the hum from the seating position or do you have too put your ear to the speakers tweeter? It maybe just the hum from the transformer in the Outlaw that your hearing. Goto your local electronics shop and pickup a cheater plug and try that too see if the hum disappears. If you have a cable box or sat box disconnect the cable connecting them to your tv and see if the hum disappears. I couldn't answer your question as I'm not an electrician, but both units have different grounding schemes, so lets say the amp has a grounding fault and you've wired it too the Denon, now the casing off the Denon would be live and anyone touching it could be in for a shock(I think)

Can I hear it from the seating position ? just barely however as soon as there's a signal i.e. Music etc.. it's inaudible,

I do not have a Cable Box but did isolate the TV and Cable for the system but no difference.

Also tried moving my CD/DVD to other outlets, a power bar for Amp and Receiver, and finally a dedicated outlet direct to the fuse panel for both.

An e-mail to Outlaws turned up the following;

I've seen the same problem in the past and this "fix" although very simple works fine when all other avenues have been explored. Ground loops are caused when components have different ground potentials, by connecting them you have broken the loop with a solid ground between the components.

Many components use a two prong plug in an effort to prevent ground induced hum, our 950 had a two prong plug. The Denon and the amp are both common ground amps so it's OK to ground their chassis, in fact your components are all sharing a ground path between their RCA jacks.

If you haven't already you may want to try plugging your components into other outlets, maybe plug your sources into something other than the Denon's A.C. convenience outlets. Often times a coax feed for a cable box is not properly grounded, disconnect the coax from the box and see if the hum disappears. If you can't easily identify it or you can't justify the expense or hassle, just leave them connected. Please let us know if you have any additional questions.

I thank everyone for your responses and welcome any more opinions/thoughts.

 

[ht_addict]

Did you try disconnecting the tv cable from the tv and see if it helps? If it does try this. If you have a power conditioner or surge protector that has a coax hookup, run the tv cable from the wall to the surge/powerconditioner and then too the tv. This worked for me when I had a hum issue at the same time protecting your tv from surges through the cable line.