Amp hum issue

[Schwingding]

This is weird.

I moved an Onix SP3 upstairs into the bedroom from where it was running off of a dedicated circuit in the basement.

Connected to nothing other than a pair of speakers, it produces an audible hum in the speakers whenever it is powered on.

It does this with the 3 pronged plug, AND it does it still with a cheater plug that doesn't use the ground. WTF?

There are lots of other things on this circuit that might cause a hum - 2 ceiling fans with IR remotes are prime candidates. But still, it does it even with the ground disconnected/cheater plug.

Any stabs at a solution? For the record - the Jolida did not hum in the same position.

[ejd]

While doing reasearch for my system I found some information about "ground loop" problems in the Outlaw 200 mono block manual. Maybe this is something you can apply to your situation.

[Skynut]

It doesn't know the words.

[Schwingding]

Thanks ejd. There is no ground loop issue present in the audio rig - the amp is the only device connected to the speakers. It hums without a CDP or anything else connected to it, or to that same receptacle.

[Skynut]

Is there electrical interferance?
I used to have a computer close to an electrical room and the monitor would act all crazy because of it.
i moved the monitor to the other side of the desk and the problem went away.

[F1nut]

There are lots of other things on this circuit that might cause a hum - 2 ceiling fans with IR remotes are prime candidates. But still, it does it even with the ground disconnected/cheater plug.


Does it hum with the ceiling fans off?

Either way, it's not a ground loop issue.

[Sherardp]

By chance can you plug into some sort of power filtering conditioner and see if that makes any change.

[appadv]

By chance can you plug into some sort of power filtering conditioner and see if that makes any change.

I'd suggest the same.

[Schwingding]

That'll be my next step - a power conditioner of some sort but I have nothing at present.

[F1nut]

Again, does it hum with the ceiling fans off? How about with all the lights off?

[treitz3]

If you take the fan out of the circuit, the noise will go away.

[Schwingding]

Yes, it does hum with the ceiling fans off, but you gotta realize that you can't really turn these fans off. They have constant juice to the IR receiver for the remote (just like your TV and other devices with remotes). I've discovered some pretty screwy wiring in my house and wouldn't be surprised if this same circuit ran all over the house.

Again, does it hum with the ceiling fans off? How about with all the lights off?

[F1nut]

you gotta realize that you can't really turn these fans off. They have constant juice to the IR receiver for the remote

There you go.

[cyberhazard]

I think my first step would be to plug the unit back into the original outlet in the basement using an extension cord. It's fast, it's simple and it's cheap. This will instantly revile how dirty the circuit you want to use is. Or, indicate a possible outside influence such as magnetic fields or solar flares.:D

Also look for fluorescent or any other lighting with a ballast, as well as dimmers. These are rare for receptacle circuits, but possible.