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  #381  
Old 04-09-2021, 10:18 PM
sleep sleep is offline
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Quote:
Originally Posted by cyberpig1 View Post
Thanks for the input.
The twitter speaker repalcement is simple procedure IMHO.
There should be no need to remove/dissassemble the midrange head.
https://youtu.be/DP_-KRfExkE

Thats why i am not so much concerned about replacing it onsite (if possible).

Here it is some info for the midrange replacement - https://youtu.be/7HOG1tYjPrc
with the right tools will be simple as that.
I never imagined that it would be that easy. But you have to use the proprietary tool kit. Looks like your dealer could do a quick house call and replace your tweeter. I bookmarked those videos in case one of my tweeters ever need replacement. Thanks very much.
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  #382  
Old 04-10-2021, 12:02 PM
Indytown Indytown is offline
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Quote:
Originally Posted by cyberpig1 View Post
Thanks for the input.
The twitter speaker repalcement is simple procedure IMHO.
There should be no need to remove/dissassemble the midrange head.
https://youtu.be/DP_-KRfExkE

Thats why i am not so much concerned about replacing it onsite (if possible).

Here it is some info for the midrange replacement - https://youtu.be/7HOG1tYjPrc
with the right tools will be simple as that.
Looks good, I would get it done on site. Even if the the tweeter housing was damaged, looks like the midrange removal is straight forward and simple, seating of a rubber gasket to reinstall the midrange may be the tricky part, looks like it took some force to pop it out, good seal.
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  #383  
Old 04-21-2021, 07:43 PM
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cyberpig1... Welcome to AA!
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  #384  
Old 05-22-2021, 10:47 AM
cyberpig1 cyberpig1 is offline
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Hi everyone!
Good and bad news at once.
The non working diamond tweeter is changed now and the speaker is back in perfect shape, shininig with crisp highs
The other speaker, which I thought has some king of problem with the high frequencies is now confirmed to be a problem ! With test track which has not more than 3-3.5kHz the tweeter is making some rustling noise. The HF filter should cut everything below 4kHz. Previously i was not sure if the ears or the room acoustic is playing with me but now with isolated track it's obvious the filter is the problem.
The other speaker tweeter is in absolute silence with this track at every amp volume level. Swapped the channels to be absolutely sure and yes the problem is in the same speaker.
Got the track played on other 3way speakers - there is no sound from the tweeters there.

I am very dissapointed from the quality control in B&W nowdays. Not mentioning the waiting time for repair. The speakers are brand new - produced in Dec 2020 , delivered in Feb 2021 to me.
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  #385  
Old 05-22-2021, 03:10 PM
Delija Delija is offline
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High-pass filter is not a brick wall, so even with 24 dB/oct (4th order) filter tweeter crossed at 4 kHz will get quite some "music" at 3.5 kHz. If tweeter is working properly - that's not a problem, of course.
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  #386  
Old 05-22-2021, 03:46 PM
cyberpig1 cyberpig1 is offline
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my bad. the highest freq of the file is 2.6 kHz.
of course the filter is not a brick wall (it is just a single expensive mundorf capacitor ), but having the comparison with the other matched speaker and some others 3 way ... there is nothing coming to their tweeters.
And even if it is ok such frequencies to come to the tweeter the sound produced is far away from normal. With music it feels like some distorted echo, which is not apparent for every ear and not very easy to describe, but with the proper test track it is right in the nose.
Anyway the ball is back to B&W tech.
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  #387  
Old 05-22-2021, 07:14 PM
Delija Delija is offline
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The point of my post is that I think the problem is the tweeter and not the crossover network.

I hope it will be fixed soon

Last edited by Delija; 05-22-2021 at 07:23 PM.
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  #388  
Old 05-22-2021, 09:19 PM
Art Vandelay Art Vandelay is offline
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Quote:
Originally Posted by cyberpig1 View Post
my bad. the highest freq of the file is 2.6 kHz.
of course the filter is not a brick wall (it is just a single expensive mundorf capacitor ), but having the comparison with the other matched speaker and some others 3 way ... there is nothing coming to their tweeters.
And even if it is ok such frequencies to come to the tweeter the sound produced is far away from normal. With music it feels like some distorted echo, which is not apparent for every ear and not very easy to describe, but with the proper test track it is right in the nose.
Anyway the ball is back to B&W tech.
It sounds as though you have a partially detached voice coil, and very likely you've had excessive hf energy or hf oscillation from the amplifier that damaged the tweeter. Chances are it happened when the other tweeter blew.

Fwiw, the most common mode of failure for diamond dome tweeters seems to be mechanical - shattering, which has been addressed with the D3 models, and other failures due to thermal stress or QC issues are quite rare.

It would be wise to get the power amp checked out to make sure it's working to spec and unconditionally stable.
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  #389  
Old 05-23-2021, 08:06 AM
cyberpig1 cyberpig1 is offline
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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.

Going back to the first tweeter change. There was some inconsistency in the color of the membrane which can be discovered only with the grill off. I don’t know if it is some problem with the “diamond” coating process or some moisture(condensation) appeared during the transportation process in the winter.

[how can attach a picture in the post here?]

At the time of delivery there was a bit of condensation on the turbine head.
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  #390  
Old 05-23-2021, 10:07 AM
Delija Delija is offline
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You need at least 10 posts to be able to post links and pictures.
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