Speaker midwoofer scratching! please help!

Toast_Master · 21st September 2007, 09:38 AM

Hello

I have a pair of American Acoustic Development (A.A.D) speakers that I have had now for 13 months and until recently they have been wonderful. The model they are are C-800i, they have 4 x 6.5" woofers and a 1" dome tweeter, 3 of the woofers are bass drivers and the remaining woofer is a mid range

I have noticed that certain frequencies make the left top 6.5" woofer scratch but 90% of the time you cant hear it, but on some quiet low bass movie and music moments it is very irritable, to test what was wrong I push the woofer and it sounds as though the voice coil windings are rubbing/scratching against the basket or another part of the woofer, so I guess some how the woofer has become unaligned because when I push th bottom of the woofer it does not scratch and does a clear inward motion,

Also I have not attempted to undo any screws or look inside the box of fear of voiding warranty but If this problem were an easy fix, Id definitely open it and fix it

If you could Help me that would be great!, because the AAD staff wont reply to my email

I also fear my model is discontinued

If any info or pics are needed just ask

Thanks Cya

phase_accurate · 21st September 2007, 09:59 AM

There is the possibility is that the voice-coil is "slightly fried" (don't know how to express this well in English). I.e the slightly melted voice-coil insulation is scratching. In this case it would be best to exchange the driver.

And there is indeed the possibility that something shifts with age. If this happened to your quite new speaker then it should go under warranty IMO.
When it happens with old speakers you can sometimes unscrew a driver and turn it by 180 degrees.

Regards

Charles

Toast_Master · 21st September 2007, 10:11 AM

I dont think its possible to exchange the driver with one that will fit or one from AAD cause they wont reply and if I do put a replacment in it, that isnt a AAD driver, It will look weird

maybe I should try the rotate 90 - 180 degrees thing, gee I hate random problems like this, the speakers are in perfect nick still and no scratches and it be such a wast of a full speaker just cause AAD wont reply

I bought these of ebay new, warranty included, but my account was suspended ages ago so I cant find the seller, the speakers have serial numbers on them

Is it possible If I got hold of AAD staff that they would send a replacement driver if I payed for postage?

I want these fixed bad, and I f I cant, what a WASTE, it pisses me off, cause then I cant even sell them properly!

thanks cya

nicoch58 · 21st September 2007, 07:51 PM

if the coil have a problem is possible repair ....search laboratory .

Toast_Master · 22nd September 2007, 01:25 AM

I did search "laboratory" and about 300+ topics come up

Toast_Master · 24th September 2007, 12:48 AM

hello

people I made the mistake of still using the speaker after I heard this scratching cause I didn't think it would get worse but now Im using this old sharp speaker as a replacement on top of it until I can find a solution , so now I think it is a fried coil because no matter where I press it now it is bad

Thanks Cya

Dave Bullet · 24th September 2007, 02:21 AM

Hi Toast-master.

A quick test - instead of unscrewing the driver and rotating it - flip the whole speaker box upside down, on its side etc... to see if a particular "side" of the coil is scratching on the pole piece / magnet.

Another possibility and this might be easier to fix, is if the voice coil is open (like Seas speakers). If so - it may be because some debris has become stuck / trapped in between the VC and magnet. It might be possible to remove it... other might have an idea.

If you can take the driver out and take some photos under the basket - ie. so we can see the top of the spider / underside of the cone) - that might reveal something.

Cheers,
David.

Toast_Master · 24th September 2007, 02:30 AM

hey

Hell yeah Its fixed, I just randomly tried it again and guess what it is fine, No noise at all, maybe it was just something in the coil and its dislodged now

Thanks Cya

peter_m · 24th September 2007, 02:49 AM

Wow, that's good to know... Never would have thought of this one.

phase_accurate · 24th September 2007, 03:29 PM

Are they made by this company ? And they don't respond to your requests ?

http://www.aadsound.com/

Regards

Charles

21st September 2007, 09:38 AM	#1
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	Speaker midwoofer scratching! please help! Hello I have a pair of American Acoustic Development (A.A.D) speakers that I have had now for 13 months and until recently they have been wonderful. The model they are are C-800i, they have 4 x 6.5" woofers and a 1" dome tweeter, 3 of the woofers are bass drivers and the remaining woofer is a mid range I have noticed that certain frequencies make the left top 6.5" woofer scratch but 90% of the time you cant hear it, but on some quiet low bass movie and music moments it is very irritable, to test what was wrong I push the woofer and it sounds as though the voice coil windings are rubbing/scratching against the basket or another part of the woofer, so I guess some how the woofer has become unaligned because when I push th bottom of the woofer it does not scratch and does a clear inward motion, Also I have not attempted to undo any screws or look inside the box of fear of voiding warranty but If this problem were an easy fix, Id definitely open it and fix it If you could Help me that would be great!, because the AAD staff wont reply to my email I also fear my model is discontinued If any info or pics are needed just ask Thanks Cya

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21st September 2007, 09:59 AM	#2
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	There is the possibility is that the voice-coil is "slightly fried" (don't know how to express this well in English). I.e the slightly melted voice-coil insulation is scratching. In this case it would be best to exchange the driver. And there is indeed the possibility that something shifts with age. If this happened to your quite new speaker then it should go under warranty IMO. When it happens with old speakers you can sometimes unscrew a driver and turn it by 180 degrees. Regards Charles

21st September 2007, 10:11 AM	#3
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	I dont think its possible to exchange the driver with one that will fit or one from AAD cause they wont reply and if I do put a replacment in it, that isnt a AAD driver, It will look weird maybe I should try the rotate 90 - 180 degrees thing, gee I hate random problems like this, the speakers are in perfect nick still and no scratches and it be such a wast of a full speaker just cause AAD wont reply I bought these of ebay new, warranty included, but my account was suspended ages ago so I cant find the seller, the speakers have serial numbers on them Is it possible If I got hold of AAD staff that they would send a replacement driver if I payed for postage? I want these fixed bad, and I f I cant, what a WASTE, it pisses me off, cause then I cant even sell them properly! thanks cya

21st September 2007, 07:51 PM	#4
nicoch58 diyAudio Member Join Date: Oct 2004	if the coil have a problem is possible repair ....search laboratory .

22nd September 2007, 01:25 AM	#5
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	I did search "laboratory" and about 300+ topics come up

24th September 2007, 12:48 AM	#6
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	hello people I made the mistake of still using the speaker after I heard this scratching cause I didn't think it would get worse but now Im using this old sharp speaker as a replacement on top of it until I can find a solution , so now I think it is a fried coil because no matter where I press it now it is bad Thanks Cya

24th September 2007, 02:21 AM	#7
Dave Bullet diyAudio Member Join Date: Jan 2002 Location: Wellington, New Zealand	Hi Toast-master. A quick test - instead of unscrewing the driver and rotating it - flip the whole speaker box upside down, on its side etc... to see if a particular "side" of the coil is scratching on the pole piece / magnet. Another possibility and this might be easier to fix, is if the voice coil is open (like Seas speakers). If so - it may be because some debris has become stuck / trapped in between the VC and magnet. It might be possible to remove it... other might have an idea. If you can take the driver out and take some photos under the basket - ie. so we can see the top of the spider / underside of the cone) - that might reveal something. Cheers, David.

24th September 2007, 02:30 AM	#8
Toast_Master diyAudio Member Join Date: Apr 2006 Location: Tasmania, Launceston	hey Hell yeah Its fixed, I just randomly tried it again and guess what it is fine, No noise at all, maybe it was just something in the coil and its dislodged now Thanks Cya

24th September 2007, 02:49 AM	#9
peter_m diyAudio Member Join Date: May 2007	Wow, that's good to know... Never would have thought of this one.

24th September 2007, 03:29 PM	#10
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Are they made by this company ? And they don't respond to your requests ? http://www.aadsound.com/ Regards Charles

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