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  #391  
Old 05-23-2021, 07:41 PM
Art Vandelay's Avatar
Art Vandelay Art Vandelay is offline
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Quote:
Originally Posted by cyberpig1 View Post
Thanks for all the ideas.
The first step will be the change of the tweeter.
Afterwards will check the amp parameters.

I am still afraid the finish will be with crossover filter change.
Will keep you posted.
Those Mundorf caps are 2% tolerance and basically indestructible, so they're the least likely elements in the chain to be at fault.
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  #392  
Old 05-25-2021, 06:00 AM
cyberpig1 cyberpig1 is offline
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I am still trying to find the connection between the theory and the result that I have in the problematic speaker. If there is an issue with the voice coil of the treeter and the impedance is going above the expected 8ohms this will change the cutoff frequency of the filter.
at 8 ohms and capacitor 4u7 the filter is expected to cut at 4.23kHz
at 12 ohms and same capacitor the cut frequency is going down to 2.82kHz

This gives me hope that there could be no problem with the filter
Let's wait for the change and will see.

Thanks once again for all you inputs!
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  #393  
Old 06-08-2021, 11:56 AM
cyberpig1 cyberpig1 is offline
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Good news!
diamond changed! ... and shining bright right now ... no noise anymore (for now)
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  #394  
Old 06-08-2021, 10:59 PM
sleeper sleeper is offline
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Default So, both tweeters failed in two basically brand new speakers?

I find that amazing, and would be very concerned to determine the cause.
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  #395  
Old 06-12-2021, 08:38 AM
cyberpig1 cyberpig1 is offline
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Hope B&W will provide feedback after observing the failed diamonds.
Its weird they failed in completely different way one from another.
1st no sound at all. strange stains in the membrane.
2nd grinding sound. no stains.

I am very concerned how long the replaced ones will last
the statistics until now : 4 months since the speakers have been delivered an two months of the time waiting for repairs.
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