Matrix 804 problem

jamesjia1234 · 5th August 2009, 10:15 PM

Hello
Got me a B&W Matrix 804 from fleabay. I was wondering if anyone on here can help me diagnose the problem: At low bass , one of the speaker produces a scracthy sound that lasted less than a second. It occurs during a low bass sound, especially with music (hard rock) with lots of drummings and lower bass.

I'm sure I'll get reprimand on this too, the speakers are currently driven by a Sony STR 5800. Any recommedation on an amp I should be looking for? And the tweeters are missing by the way. thank you for your expertise!
j

PeteMcK · 6th August 2009, 01:55 AM

...sounds like a partly fried voice coil to me...

chrismercurio · 6th August 2009, 09:32 PM

sounds like a rubbing voice coil. probably the black poly one...though it could be the kevlar one.

Do you know how to test for that?

Just push in the woofer (gently) with no music playing and see if you hear/feel any friction. If you do, contact a local (to you) B+W dealer about getting a replacement which will most likely be expensive for what you get.

5th August 2009, 10:15 PM	#1
jamesjia1234 diyAudio Member Join Date: Aug 2009	Matrix 804 problem Hello Got me a B&W Matrix 804 from fleabay. I was wondering if anyone on here can help me diagnose the problem: At low bass , one of the speaker produces a scracthy sound that lasted less than a second. It occurs during a low bass sound, especially with music (hard rock) with lots of drummings and lower bass. I'm sure I'll get reprimand on this too, the speakers are currently driven by a Sony STR 5800. Any recommedation on an amp I should be looking for? And the tweeters are missing by the way. thank you for your expertise! j

6th August 2009, 01:55 AM	#2
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	...sounds like a partly fried voice coil to me... __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

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6th August 2009, 09:32 PM	#3
chrismercurio diyAudio Member Join Date: Aug 2006 Location: Silicon Valley	sounds like a rubbing voice coil. probably the black poly one...though it could be the kevlar one. Do you know how to test for that? Just push in the woofer (gently) with no music playing and see if you hear/feel any friction. If you do, contact a local (to you) B+W dealer about getting a replacement which will most likely be expensive for what you get.

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