BeoLab 8000 modification: do you know this?

6 replies
KolfMAKER
Offline
KolfMAKER
Bronze
Posted September 15, 2023 at 04:10 GMT
#1642688
I recently saw a BeoLab 8000 with a capacitor added to PCB02. It looked like in the pictures below. I believe the capacitor is connected to two pins of the main IC.

Question

Does anyone know what kind of modification this is, or what it solves?



Overview



Close-up

Location: The Netherlands

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beosound.png Beosound.png
Beosound-9000.png Beosound-9000.png
Beolab-18.png Beolab-18.png
DI
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Die_Bogener
Bronze
Posted September 16, 2023 at 09:55 GMT
#1658824
Is the crossover network still existing and fully mounted?

Otherwise ist could be a bypass for the crossover...

But it looks like a standard work of B&O... ???

Check, wether this cap manufacturer is also used on the board.
KolfMAKER
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KolfMAKER
Bronze
Posted September 16, 2023 at 15:24 GMT
#1658828
Thnx for responding Die_Bogener! Answering your questions ...
  • Yes, the crossover network is existing and fully mounted.
  • I am not sure if this is the standard work of B&O. I showed a picture to a former B&O repair engineer. He did not recognize this.
  • The cap manufacturer I believe is different than what's used on the PCB's.

Location: The Netherlands

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beosound.png Beosound.png
Beosound-9000.png Beosound-9000.png
Beolab-18.png Beolab-18.png
DI
Offline
Die_Bogener
Bronze
Posted September 16, 2023 at 16:26 GMT
#1658830
Probably the crossover ist defect or the one who did this wanted to change the sound.

Either more bass or treble... but without filter this is senseless and will destroy the speakers.

If it is treble: very nice to send low frequencies to a tweeter, this will extend lifetime... to some minutes.

And if it is bass: ok, this will kill the amp...
KolfMAKER
Offline
KolfMAKER
Bronze
Posted September 18, 2023 at 15:13 GMT
#1658872
Thanks again for your comments!

I have removed the capacitor, to check if this made a difference.
Result = no difference. Sound is the same, functioning of the speaker system is the same.

I will just leave it as is, without the capacitor. Probably better to avoid damage.

Location: The Netherlands

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovox.png Beovox.png
Beosound.png Beosound.png
Beosound-9000.png Beosound-9000.png
Beolab-18.png Beolab-18.png
LE
Offline
LeHe
Bronze
Posted February 17, 2025 at 11:24 GMT
Edited February 17, 2025 at 11:28 GMT
#1668855
Came across this old post.

This modification was also applied ex works to my 1995 1155 xxxx speakers. ( same construction)

Checking the PCB02 schematic shows that this capacitor 4.7 uF has been applied as an additional interference suppression and smoothing on the negative supply of - 15 volts.

I think that de reason for this modification was discovered during the final test of the product. Maybe interference or voltage dips.

So leave it as it was  or rebuild it. The manufacturer did this for a reason and is not a hobbyist's invention.
Attachments (1)

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovision-10.png Beovision-10.png
Beosound.png Beosound.png
Beosound-Shape.png Beosound-Shape.png
Beoplay-E8.png Beoplay-E8.png
Beoplay-A2.png Beoplay-A2.png
Beolab-18.png Beolab-18.png
Beocenter-2.png Beocenter-2.png
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