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subwoofer problem


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willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: July 07, 2007 at 8:53 PM / IP Logged  
I just installed a brand new subwoofer and it sounded great at first, but after maybe the second or third hour of play the sub now sounds horrible... every time I turn the volume up a little now the sub has a rattling sound... What is the problem? My first reaction is the subwoofer is blown. Any help appreciated.
jurb 
Member - Posts: 39
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Joined: May 23, 2007
Location: United States
Posted: July 07, 2007 at 9:01 PM / IP Logged  
My first step would be to take the sub back out and use a multimeter to check the resistance across the coil(s). If is still what it is supposed to be probably either 2 or 4 ohm my guess would be that the sub isn't blown and that perhaps it's a mechanical problem. Just a thought I am sure others will post more.
furflier 
Copper - Posts: 236
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Joined: June 14, 2004
Location: United States
Posted: July 07, 2007 at 9:30 PM / IP Logged  
 Sounds like you have blown the sub. What did you have it connected to & how? Also what kind of sub? What type of box? What kind of amp? How did you set your gains?
willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: July 07, 2007 at 9:42 PM / IP Logged  
The sub is a 10" Orion H2 dual 2 ohm and I had it hooked up to an Orion 1200 mono D amp. It is in a subzone vented .75 cubic ft enclosure. The sub's voice coils were wired in parallel.
Do whatever makes you happy in life without diminishing the happiness of others
furflier 
Copper - Posts: 236
Copper spacespace
Joined: June 14, 2004
Location: United States
Posted: July 07, 2007 at 10:01 PM / IP Logged  
You most like sent aclipped signal to the sub causing the voice coil to fry. Do a search on this forum for proper gain setiing. There is alot of useful info that will prevent this from happening again.
willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: July 08, 2007 at 3:49 PM / IP Logged  
Whenever I listen to the sub it still plays bass, but with a crackling noise too. This kinda leads me to believe that there is either a bad connection with the wiring to the sub, or only one of the voice coils is blown and the other one is still fine. I will check it out and see if I can find out what's wrong.
Do whatever makes you happy in life without diminishing the happiness of others
willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: July 09, 2007 at 3:13 PM / IP Logged  
I took the subwoofer out of the enclosure to investigate this problem. I am at a loss here... I checked the voice coils and they are both still working. The connections are also good. The only way I can make this 'rattling' sound go away is to turn the amp gain way down, and turn down the bass on my head unit. Of course the rattling is going to go away then because it is hardly playing any bass. This rattling sound seems like it's coming from the cone of the woofer, almost as if it is a "backfire", so to speak, from the subwoofers movement. Could it be possible that this sound could be caused from the sub being in a vented enclosure that is way too small. The owner's manual calls for a vented 1.0 cubic ft enclosure. (That's the net volume excluding the basket and port displacement) The net volume that the sub is seeing now is only .47 cubic ft. I know for a fact that this sub should be hitting extremely hard and for some reason it isn't. I even considered that maybe the sub I have might possibly be defective or something...  I would certainly love to hear any opinions as to what the heck is going on here.
Do whatever makes you happy in life without diminishing the happiness of others
zhalverson 
Copper - Posts: 180
Copper spacespace
Joined: January 21, 2005
Location: United States
Posted: July 09, 2007 at 5:18 PM / IP Logged  
Sounds to me like the cone came loose from the voice coil former (the part the cone connects to).  Move the cone up and down and see if it slides on the former.
willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: July 09, 2007 at 11:41 PM / IP Logged  
it doesn't
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: July 10, 2007 at 12:11 AM / IP Logged  
Lead slap, partially unglued wire WITHIN the voicecoil windings, voice coil came loose from one of it's connections...
Whatever it is, the woofer is bent. You'll have to return it and have it replaced.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
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