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Beolab 3500 unbalanced sound

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Hiort
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Hiort Posted: Mon, Nov 11 2013 10:06 AM

Have invested in a preowned Beloab 3500. Manufacturing year 2001.

I have noted that the right hand side of the speaker plays louder than the left side.

Balance is set in the middle. Its very clear that the sound is stronger on the right side when I move balance from "side to side".

What could be the problem?

Assume that the Masterlink connection cannot be the source of such a problem.

Any hints is appreciated.

 

 

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Millemissen
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You could test that by swapping the BL2000 to the place/the Ml where you have the problem.

MM

There is a tv - and there is a BV

Langleyav
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Langleyav replied on Mon, Nov 11 2013 10:32 AM

It could be the Masterlink circuit.   The audio is distributed in a Balanced format and if one of the channels has one wire off, then that channel will be 6db lower in level (half the volume of the good channel). Check the continuity of the faulty channel for open circuit condition on one of the wires.

Ron

 

Hiort
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Hiort replied on Mon, Nov 11 2013 11:16 AM

Thanks both for the suggestions.

For a possible wire off in e.g. the junction box I understand I particulary should check the following wires for left channel:

white/orange 

orange

Correct?

Will check this evening.

 

/Claes

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Hiort
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Hiort replied on Mon, Nov 11 2013 8:33 PM
Did some checks and it shows that also the BL2000 have a weak left channel. It's not so evident since the speakers are so close to each other.

I have also connected the BL3500 directly to the Audio source and then the sound was as good as I expected, and no problem with the balance. Hence clearly a problem in the link system.

Have checked all the junction boxes but see no problems.

Would a B&O service techie be able to do measurements to find the faults?

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Millemissen
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Did you use B&O ML-cables everywhere? (that is, if you yourself did the installation).

Surely it can be measured, but do check the plugs as well.

MM

There is a tv - and there is a BV

berlin2010
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berlin2010 replied on Mon, Nov 11 2013 10:36 PM

Hiort, see this thread http://archivedforum2.beoworld.org/forums/t/6106.aspx - i had a similar problem and it was the Masterlink connection (photo's in the thread i referenced) . Check your source's masterlink connector as well.

valve1
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valve1 replied on Tue, Nov 12 2013 6:24 AM

Hiort:
Would a B&O service techie be able to do measurements to find the faults?

Why not use a multi meter yourself ?' Tip them out" as we say.

You will need a second person if the source and 3500 are in different rooms.

Hiort
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Hiort replied on Tue, Nov 12 2013 9:04 AM

Millemissen:

Did you use B&O ML-cables everywhere? (that is, if you yourself did the installation).

Surely it can be measured, but do check the plugs as well.

MM

Yes, its B&O original everywhere. 

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Hiort
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Hiort replied on Tue, Nov 12 2013 10:52 AM

valve1:

Hiort:
Would a B&O service techie be able to do measurements to find the faults?

Why not use a multi meter yourself ?' Tip them out" as we say.

You will need a second person if the source and 3500 are in different rooms.

I´m not really a friend with multi meters. I simply do not know how to setup the measurement.  Smile

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Hiort
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Hiort replied on Tue, Nov 12 2013 12:12 PM

berlin2010:

Hiort, see this thread http://archivedforum2.beoworld.org/forums/t/6106.aspx - i had a similar problem and it was the Masterlink connection (photo's in the thread i referenced) . Check your source's masterlink connector as well.

Thanks for the reference. I have checked all connectors, and they are all good.

I have narrowed down to that the problem must be in either a wallsocket or a junktion box where the cable is split into two.

Will open that junctionbox and the wallsocket this evening.

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Hiort
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Hiort replied on Tue, Nov 12 2013 9:23 PM

Hiort:

valve1:

Hiort:
Would a B&O service techie be able to do measurements to find the faults?

Why not use a multi meter yourself ?' Tip them out" as we say.

You will need a second person if the source and 3500 are in different rooms.

I´m not really a friend with multi meters. I simply do not know how to setup the measurement.  Smile

I have now checked everything an cannot find any problems.

"valve1" Are you able to give me simple instructions on how to do measurements?

/C

 

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

stefan
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stefan replied on Tue, Nov 12 2013 9:50 PM

I`d disconnect all products from ML and measure connection of orange/white, orange and corresponding ground (blanc wire) from first to last junction box with multi meter- maybe it will be some distance so you will need a long wire and a second person.

Stefan

Hiort
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Hiort replied on Wed, Nov 13 2013 5:17 AM
stefan:

I`d disconnect all products from ML and measure connection of orange/white, orange and corresponding ground (blanc wire) from first to last junction box with multi meter- maybe it will be some distance so you will need a long wire and a second person.

Stefan

Thanks Stefan!

However, I need you to be more specific than this :) I'm a total noob when it comes to these multi meters.

E.g. What should the values be? Ground on one junction box and orange on the other junction box?

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

valve1
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valve1 replied on Wed, Nov 13 2013 8:04 AM

Hiort, what type of multi meter do you have ? Digital or analogue ?

If digital, do you have a music symbol on the ohm scale ?

Hiort
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Hiort replied on Wed, Nov 13 2013 8:28 AM
valve1:

Hiort, what type of multi meter do you have ? Digital or analogue ?

If digital, do you have a music symbol on the ohm scale ?

Well, I have to get a meter, so lets assume I have a digital one :)

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

Hiort
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Hiort replied on Wed, Nov 13 2013 8:35 AM
valve1:

Hiort, what type of multi meter do you have ? Digital or analogue ?

If digital, do you have a music symbol on the ohm scale ?

Lets assume I have this meter:

http://www.tester.co.uk/uni-t-ut120a-pocket-size-type-digital-multimeter

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

stefan
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stefan replied on Wed, Nov 13 2013 10:50 AM

You don`t need to measure any values - it`s just the connection - yes or no.

Most digital meters give a kind of beep sound if it detects connection - that`s all you need.

Set your meter to ohm scale.

Maybe this helps (from minute  2:20 - 3:20):

http://www.youtube.com/watch?v=LPaTsBrd-Tg

Stefan

Hiort
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Hiort replied on Fri, Nov 15 2013 7:38 AM

Thanks everyone for providing helpful hits on how to narrow down the problem.

After simply redoing all junctionboxes and still no improvements, I was advised by a B&O Service guy to check the ML Wallsocket. His experience was that in 9 out of 10 cases the wallsocket is the problem. I had only visually inspected the termination of the ML leads in the wallsocket. 

After simply redoing the orange and orange/white lead termination, I believe that the BL3500 sounds as it should.

The technichian will lend me a Masterlink Tester next week, so that I am sure very thing is top notch.

/C

 

 

 

 

 

Livingroom: BL3, BL11, BV11-46 Kitchen: Beosound 1 GVA, Beocom 2 Bathroom: M3 Homeoffice: M3, Beocom 2  Library: Beosound Emerge, Beocom 6000 Bedroom: M5, Essence remote  Travel: Beoplay E8 2.0, Beoplay EQ, Beoplay Earset

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