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Beolab 8000 hiss noise

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danhar707
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danhar707 posted on Mon, Jul 14 2014 12:13 AM

Hi all,

Wondering if anyone has seen this before and knows what might be wrong to give me a headstart and hopefully avoid having to post the speaker to a repairer...

One of 4 beolab 8000s we have has started making a hissing noise as soon as it switches on (led to green). It starts quiet and builds up over a minute or so. It can also fade in and out fairly randomly. I've tried different sources and cables and it definately follows the speaker. From putting my ear close, sounds to me like its confined to the tweeter. Probably need to get the fret off to confirm 100%.

Note, I drive all 4 from a NAD 910 av processor pre amp using the speakers' line in inputs, not that this is relevant. Just to be sure, I even dusted off the old beocenter 9300 and tried the speaker via power link - same.

Any ideas where to start people? I'm fairly handy and have a decent workbench. Ideally want to Avon sending the speaker off somewhere.

Dan

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danhar707
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Anyone?

elephant
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elephant replied on Wed, Jul 16 2014 11:42 PM
Have you swapped cables/speakers to be absolutely sure ?

Swapping the amp was a good idea so it is most likely inside the speaker ...

BeoNut since '75

stephenportland
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Hello Dan - I have exactly the same problem with my Beolab 8000 - and it's not the cable or the amp - did u find a solution ?

Regards

Stephen

 

 

stephenportland
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Hello Dan - I have exactly the same problem with my Beolab 8000 - and it's not the cable or the amp - did u find a solution ?

Regards

Stephen

 

 

Evan
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Evan replied on Mon, Nov 2 2015 11:51 AM
I seem to remember an 'equalizer' card inside the speaker coming loose on some 8000s and causing some headaches. Apparently it is just easily jostled out of place.

It has been years since I've read about this.. Hopefully someone with some early 8000s can comment.

In the meantime, I'll try to dig up the thread on the archived forum.

Beo4 'til I die!

Michael
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I have a pair of BeoLab 8000 that was just repaired for this very problem! I also found no information about it but the service technician replaced the power supply and crossover boards, updated them to the latest edition. They now sound excellent. 

In my case the problem was not audible for the first hours of use after plugging them in after a few hours without AC power but after having them plugged in (in standby or in use) they would make the noise as soon as they are turned on, a very annoying noise.  

Beolab 50, Beolab 8000 x 2, Beolab 4000 x 2, 
BeoSound Core, BeoSound 9000, BeoSound Century, 
BeoLit 15, BeoPlay A1, BeoPlay P2, BeoPlay H9 3rd Gen, BeoPlay H6, EarSet 3i, 
BeoVision Eclipse Gen 2 55", BeoPlay V1-40, 
BeoCom 6000 and so much else :)  

marexy
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marexy replied on Fri, Jan 1 2021 11:47 AM

Hi

I have same problem with my bl8000.

Any of yuo find any fix for these issue? ANY hint ?

 

 

marexy
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marexy replied on Sun, Jan 31 2021 10:18 AM

Hi 

I have try to find source for that error but with no luck.

As i have some very good experiance with some expert here , would it be possible to some one give some direction where to look :(

Have swap some cond's but no luck till now :( SadErm..

Thanks  

 

KolfMAKER
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Hi Marexy, I have the same issue of 'hiss' with two pairs of BeoLab 8000.

Did you find any solution in the meantime?

KolfMAKER
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Hi Evan, have you been able to find the old thread about this issue?

marexy
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marexy replied on Sun, Jun 27 2021 10:17 AM

yes...fixed...preamplifier issue. One of poamp has been bad. 

KolfMAKER
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Great to hear you solved your issue!
I am very much interested to understand in detail what the source of your problem was.

Can you please tell me more?

I guess you are referring to an opamp (instead of a poamp).

  • Which one was it?
  • Can you describe the component (code as mentioned in the schematics for instance; IC nr ..)?

Your solution might also solve my issue, hope to hear from you. 

marexy
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marexy replied on Mon, Jun 28 2021 3:42 PM

Hi 

If you do not know smd repair and hot air soldering can be a big problem.

Try to change all  poamp on pcb and maybe you will heve luck.

KolfMAKER
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Thanks for responding Marexy.

I can handle SMD replacements.

 

Do you mean yo replaced all OpAmps on the PCB?
Didn't you investigate which one was defect, to any replace the broken one(s)? 

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