beolab 4000 smal humming sound when idle.

[JP]

As the topic.

when in low volume or idle its a low humming from both speakers. one slightly more than the other.

i know its not det signal and i have opened them and checked the isolation, its white and in good condition.

so B&O aficionados is there a simpel fix for the issue like cleaning som contact?

// first time bang & olufsen owner.

[KolfMAKER]

What input do you use: PowerLink or RCA?

[JP]

i use RCA, have tryd powerlink from my beocenter 3000 with same result.

[Ravsted]

Some noise is normal.

Especially for speakers with class A/B amplifiers.

If the power LED on your speakers are also a power switch then they got class A/B amps. If the LED is LED only (not a switch you can push) they got IcePower digital amps.

If you can hear the noise within 1 meter distance but not let’s say 2 meters away it’s what I would define as normal.

[JP]

I understand it’s normal when the speaker is 20 years old. but I don’t believe b&o intended the noise to be there.
Someone must have solved the same problem before.

[Dillen]

It could be a matter of using a properly screened signal cable.

Martin

[JP]

Dillen wrote:

It could be a matter of using a properly screened signal cable. Martin

i use chord company crimson vee 3. I’m thinking it’s som internal connection in the speakers, but I’ll try another cable to eliminate that ?

[JP]

It was not the signal cable.

gone have to open them up and look around, my idea is that it has to do with the auto on and power supply.
anyone who has opened this things up and tinkered with those things?

have googled some vids about how to do, but it would be much easier if some one who actually hade a clue could pinpoint me to a specific capacitator or such.

best regard

[Dillen]

Beolab 4000 will never be 100% quiet.
It’s more or less in the nature of active speakers. Keep in mind that they
are on max volume constantly and will amplify every bit of noise picked up by the
signal cable (read: “antenna”).
Even with a shorted RCA plug inserted, they will almost always produce a very slight hum when out of standby.
As mentioned by Ravsted above, if you cannot hear it unless very close to the speaker, it can be considered normal.

Martin

[Author]

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