BeoLab 8000 loud distortion

18 replies

I have a pair of BeoLab 8000 that is behaving very strangely. 

They both make a humming noise that is very noticeable while powered on but one of the two also makes a buzzing sound that is very annoying. If I disconnect them from the mains for an hour and use them, they will sound better but as they warm up they will start making the humming/buzzing again. 

I have tried different cables and different setups (Powerlink MK1/2/3 and RCA-cables, different BeoSounds, BeoVision and AirPort Express) and they always sound the same so I do not think it is the cables.

Example recording of the noise from the buzzing speaker:

Not an expert, but could it be some kind of electric load on the amplifiers?

You should have them serviced, or adjusted by someone who know what they are doing.

It is a bit strange that both have the same problem... doesn't it come from the source?

I have had humming with all of my B&O equipment. It turned out that it was the antenna cable I had connected (cable antenna).

PhilLondon wrote:

It is a bit strange that both have the same problem... doesn't it come from the source?

They both have a hum, but one makes a very high buzzing noise. I have updated the original post with a link to a sound to explain. And as I said, I have tried several sources, unfortunately.

Leosgonewild wrote:
I have had humming with all of my B&O equipment. It turned out that it was the antenna cable I had connected (cable antenna).


It is not the antenna cable, and I have tried different combinations of units so the problem is definitely in the speakers themselves.  

I've noticed that the buzz is much higher in one of the speakers but both suffers from distortion. If I disconnect them from power for a few hours and connect them again - then excellent sound! For a little while. Then distortion again.

Unplug, wait a few hours - great sound again for a while. Very strange but seems to be a problem component that I should replace or have replaced.

No one here ever had the same problem? Since I have two speakers with the issue I think more people should have had the problem. But perhaps it is a result of a thunder strike or something?

That's certainly a horrible noise!  Sounds to be an internal component failure of some description especially as it resolves after unplugging for a while and then taking time to return.  Definitely not cable related, nor source if you've tried different sources.

My BL8000's make an extremely faint buzz (barely audible) but I know it's due to the PL cables - I've replaced one (the easy one to get to and it resoolved it)  I have new ones ready to use from Steve at Sounds Heavenly when I get the time to do it as part of finishing the set-up of my TV and sound system.

Looks like you may have a trip to the repair shop unless anyone has any other ideas?

Dave.

Michael, you can try one thing that I have to do sometimes (a technician trick) : some oxydation can occur on the powerlink connections : unplug and replug the powerlink cables for approx ten times.

It works for me when I have a huge "pop" when touching the cables.

Let us know...

Michael wrote:
I've noticed that the buzz is much higher in one of the speakers but both suffers from distortion. If I disconnect them from power for a few hours and connect them again - then excellent sound! For a little while. Then distortion again.

 

 

Unplug, wait a few hours - great sound again for a while. Very strange but seems to be a problem component that I should replace or have replaced.

 

 

No one here ever had the same problem? Since I have two speakers with the issue I think more people should have had the problem. But perhaps it is a result of a thunder strike or something?

Have you tried swapping the PL cables, Left and Right, to see if the worse distortion/buzz moves with the cable or stays in the same speaker? If it stays the same, also try switching the speakers L and R switches, see if it is in the speakers or the source.

It sounds, from your description of how it works after being shut down, like it's a temperature sensitive component or power supply. It's odd that it's both speakers, I wouldn't have thought both would develop the same issue at the same time. Are you sure it's not the source component? I assume the source component is also off when the speakers are unplugged, though if unplugging the speakers makes a difference over having them plugged in and on standby it's not likely to be the source. You might try hooking the speakers up to something like an iPod or preamp via the RCA connectors and see if it still does it.

Perplexing problem, but you're probably going to need service tech sadly. My 8000s have been flawless since 1997 thankfully. The loaner pair I had did have one issue, the light would not go green when they went from standby to operate, it stayed amber indicating a fault until they had been on for a while then you could see it gradually turn from amber to green. I've not seen or heard a problem like yours though.

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