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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
hi
i had an issue this morning with my pair of beolab 9. When I switch them on (tv source), there was a regular knock sound coming from the bass woofer. The tweeter and medium worked perfectly.
I changed the cable...same regular sound.
I have removed the woofer and have a look behind it. The audio cables (black and red) is protected by a kind of insulating foam. A little part of this insulation foam didn't cover the audio cables and these cables was not far from another one that was surely conductor.
I put some distance between both and everything work perfectly since.
olivier
4 beolab 5, beolab 9, beolab 10, beolab 5000, beolab 8000 mk2, beolab 6002, beolab 3500, beovision 7 55 mk2, 2 beovision 11 46 mk4, beotime, beosound ouverture, beosound essence, beoplay A8, beomaster 900 RG de luxe and the collection continues...
BeoNut since '75
You ´re welcome.
Hope this helps.
The speakers was stocked after a house move and I have to transport them, so this can explain why the cables has moved. This is a little frightening.
As a BL9 owner, thanks for sharing your experience! Undoubtedly the move was instrumental in causing this. As the Beolab active speakers all have smaller interior volumes, and more stuff packed in them, cables, amps, etc. this is perhaps understandably more likely to happen in them than a conventional speaker that has bigger volumes and less in them. Wondering if a cable locating tie or thing broke in the move perhaps.
Jeff
I'm afraid I'm recovering from the BeoVirus.
I would add, I advise that when putting a driver back in, especially a large woofer, to tighten the screws in a pattern rather than one after the other fully tight in a circle. Basically, tighten them all somewhat firmly, then tighten say top, then the bottom, then the one to the right or left of the top one, then the one across from that, sort of like torquing the head bolts on an engine. Keep tightening them a bit at a time until you get to where you are cinching them snug, to keep from putting stress on the woofer frame and make sure the gasket seats properly. I do this for tweeters too although it's not as vital, but it's still a good idea.
I didn't do it in circle, don't know why. This is the same technic than the alloy wheels, in cross ?
Could you please explain why we have to do like this ?
I personnally find the head of the bang olufsen screws very fragile. Last time I wanted to remove beolab 4 from their high stands and I wasn't able to remove one of the 3 screws.
We used to tighten them too much and when we want to remove them the head doesn't support several removal after. Now when I do it I have always keep in mind that I would probably need to do it again several times.
"to keep from putting stress on the woofer frame and make sure the gasket seats properly. I do this for tweeters too although it's not as vital, but it's still a good idea."
ok understood.
olvisab: I didn't do it in circle, don't know why. This is the same technic than the alloy wheels, in cross ? Could you please explain why we have to do like this ? I personnally find the head of the bang olufsen screws very fragile. Last time I wanted to remove beolab 4 from their high stands and I wasn't able to remove one of the 3 screws. We used to tighten them too much and when we want to remove them the head doesn't support several removal after. Now when I do it I have always keep in mind that I would probably need to do it again several times.
Yeah, same thing as with alloy wheels and cylinder heads. And they have to be tight enough they don't leak but don't have to be too tight either, not only for screw damage/removal issues but because too tight and the gasket compresses enough the driver can cause more vibration to the cabinet. How tight? Lord knows, some speakers I've seen in the past spec it, most just are screws into fiberboard which means overtightening strips them. But snug, how's that for a technical term? Like eentsy weentsy, that's a technical term too! Kind of like the old definition in court of obscenity, I can't define it but I know it when I see it...
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