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: Western Sydney	...sounds like a partly fried voice coil to me... __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help With Amp For B&W Matrix 3's	led_zeppelin	Solid State	0	9th October 2006 01:14 AM
Matrix Amp?	Mike L.	Tubes / Valves	1	6th October 2004 04:57 PM
B&W Matrix 3's	led_zeppelin	Swap Meet	4	13th July 2004 07:37 PM
B&W Matrix 3's	led_zeppelin	Multi-Way	0	15th December 2003 12:58 PM
To matrix or to not matrix?	Trist	Subwoofers	8	15th July 2001 08:48 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

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.