Underhung mid-woofers?

aptquark · 9th July 2010, 05:35 PM

Hello,

Does anyone have any ideas as to why one of these drivers is producing MAJOR distortion? These are from an Acoustic zen adagio speaker. Di'appolito design. I don't feel any coil rubbing, and everything looks and feels fine. One thing possibly worth mentioning is that...this is a very scientific test btw...when I blow into the vent hole, one driver ( the good one) has slightly less air heard escaping than the bad one. I guess the air is exiting out the spider? Normal scenario I think, but visually and mechanically I don't understand why it would sound so crackly.

Any ideas?

Cyrille · 9th July 2010, 07:15 PM

Hello.

Did you make some particular usage just before cracking ??
I mean playing loud for a party or something out of their normal use ??

Do they have the same DC resistance ??

aptquark · 9th July 2010, 08:04 PM

No loud parties. Same resistance. One just sounds VERY distorted.

Cyrille · 9th July 2010, 08:15 PM

Hello.

Look to the gluing of the dust cap, spider and maybe surround.

aptquark · 9th July 2010, 10:00 PM

Quote:

Originally Posted by Cyrille

Hello.

Look to the gluing of the dust cap, spider and maybe surround.

Yea, did that too. It looks fine.

Cyrille · 10th July 2010, 08:47 AM

Hello.

I suppose you do, but did you exchange driver on amplifier channel ??
I mean did you absolutely verify the electronic chain ??

aptquark · 10th July 2010, 09:03 AM

Quote:

Originally Posted by Cyrille

Hello.

I suppose you do, but did you exchange driver on amplifier channel ??
I mean did you absolutely verify the electronic chain ??

Absolutely. This is one of the most obvious diagnosis that I have ever come accross. Robert Lee of AZ said he would gladly replace. He's a kind man. But I'm just curious WHAT could be causing this?

sangram · 10th July 2010, 09:43 AM

Loose tinsel lead?

Cyrille · 10th July 2010, 11:17 AM

Hello.

Quote:

Originally Posted by sangram

Loose tinsel lead?

Yes, it could.
Most of time this type of problem occur with variable intensity with music signal.

On an Altec 414A I had this problem with loud "cloc" and change in the acoustic level, it did look like cut voice coil... total repair under garanty (I'd just change the clothe surround), I was sad, and sorry for my client when I discover the problem.

aptquark · 10th July 2010, 11:21 AM

Quote:

Originally Posted by sangram

Loose tinsel lead?

I checked that. It is soldered ok to the terminals. So...it could be loose on the end where it goes into the cone?

9th July 2010, 07:15 PM	#2
Cyrille diyAudio Member Join Date: Apr 2008	Hello. Did you make some particular usage just before cracking ?? I mean playing loud for a party or something out of their normal use ?? Do they have the same DC resistance ?? __________________ Best regards, Cyrille PINTON. http://cyrille-audio.fr/

9th July 2010, 08:15 PM	#4
Cyrille diyAudio Member Join Date: Apr 2008	Hello. Look to the gluing of the dust cap, spider and maybe surround. __________________ Best regards, Cyrille PINTON. http://cyrille-audio.fr/

10th July 2010, 08:47 AM	#6
Cyrille diyAudio Member Join Date: Apr 2008	Hello. I suppose you do, but did you exchange driver on amplifier channel ?? I mean did you absolutely verify the electronic chain ?? __________________ Best regards, Cyrille PINTON. http://cyrille-audio.fr/

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9th July 2010, 08:04 PM	#3
aptquark diyAudio Member Join Date: Jun 2010 Location: MS Blog Entries: 1	No loud parties. Same resistance. One just sounds VERY distorted.

10th July 2010, 09:43 AM	#8
sangram diyAudio Member Join Date: Sep 2002 Location: India	Loose tinsel lead?

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