Beolab 6000 active speakers - Loud humming noise

copilot

Standard Member
Hi there

Looking for some help in diagnosing a problem.

Have an Arcam AVR350 amp with line out leads into Beolab 6000 speakers. Occasionally the speakers used to give off a humming noise that got progressively louder, simple touch of the RCA plugs into the back of the amp sorted this. Recently its got more often and now seems permanent.

Have tried different leads, unplugged items from the amp, only cure is when any RCA plug and lead is not connected to the speakers and that's also with the other end free. So seems like the speakers? But both of them, that's unusual right?

Any help or peoples experience with similar faults would be appreciated.

Cheers

Harvey
 

Kurchatov

Banned
Possible causes include

Dc offset fault in the amp

Earthing fault in the system

Faulty cable connection somewhere.

To clarify the problem, does the hum come from both speakers equally?

Does it occur on all inputs to the amp?

Is there a possibility to make a seperately earth connection between the speakers and the amp?

Earth loop is a common cause if seperately components are all earthed individually through the mains plugs.
 

copilot

Standard Member
Hi there, thank you for the reply, answers below:

Yes the noise is equal on both speakers

Earth connection - Not sure how to do this. The speakers only have live and neutral feeds, no earth on the power lead.

The humming noise is present even when disconnected from the main amp, so assume the fault is in the amps in the speakers?

Much appreciated
 

Mark.Yudkin

Distinguished Member
Hi there, thank you for the reply, answers below:

Yes the noise is equal on both speakers

Earth connection - Not sure how to do this. The speakers only have live and neutral feeds, no earth on the power lead.

The humming noise is present even when disconnected from the main amp, so assume the fault is in the amps in the speakers?

Much appreciated
What gets me is that you say it's intermittent. If it were permanent, I've have said earth loop and asked you to disconnect all your TV feeds (aerial, sky, satellite, freeview, cable) and ask what happens.
 

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