Technical question - Bookshelved woofer not moving - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 3 Old 01-10-2014, 05:05 AM - Thread Starter
Senior Member
 
steven1110's Avatar
 
Join Date: Aug 2008
Posts: 235
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 11
I bought a pair of used Monitor Audio GX100's and after hooking them up last night I noticed the bass was weak from one speaker. I went and touched the driver and it was very very slightly vibrating so I turned off the system and manually pushed on the driver. It didn't budge at the center and at the edges it only slightly moved but was definitely "pinned" at the center. It also seems that the woofer is roughly at zero displacement, meaning that the driver isn't seized in or out of it's neutral position.

What could cause a woofer to seize in this manner? Is there anything I can do to try to fix it before returning it to sender or purchasing a woofer from M.A.?

Thanks!

EDIT** I should also note that the speaker's box was a little rough upon delivery. Could it seize from a hard jarring?
steven1110 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 01-10-2014, 05:54 AM
AVS Special Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 9,269
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 1191
Quote:
Originally Posted by steven1110 View Post

What could cause a woofer to seize in this manner?
A blown voice coil or a fractured magnet structure.
Quote:
Is there anything I can do to try to fix it
No.
Quote:
I should also note that the speaker's box was a little rough upon delivery. Could it seize from a hard jarring?
Dropping it can cause the adhesive holding the magnet structure together to fail.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
Bill Fitzmaurice is online now  
post #3 of 3 Old 01-10-2014, 06:14 AM - Thread Starter
Senior Member
 
steven1110's Avatar
 
Join Date: Aug 2008
Posts: 235
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 11
What can cause the voice coil to blow or the magnet to fracture? Overdriving?
steven1110 is offline  
Reply Speakers

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off