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Blown sub?

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Old 10-31-2009, 11:27 PM
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Blown sub?
What are the signs of a blown sub? My sub works....but at low volumes theres a knocking sound from it. You dont notice it if the volume is up. It sounds like if something is loose under the dust cap.hmmm. Its a Digital Designs 2515 btw. I've made a small video of it where im tapping the cone and you can hear the sound. When i push down on the centre of the cone theres no scratching sounds or anything. Any ideas what this sound is and if i might be able to repair it?
http://www.youtube.com/watch?v=QtXM7xb5pvg

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Old 11-01-2009, 02:14 AM
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fixed ;-)


can you hook it up to the amp and play some test tone to reproduce the problem?

Also measure the impedance of the coil(individually) with a DMM and report back
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Old 11-02-2009, 08:19 PM
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Heres the second video with the sub alone. Out of the box. Sounds nasty...
Last edited by suspeck; 11-02-2009 at 08:55 PM.
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Old 11-02-2009, 08:29 PM
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Originally Posted by suspeck
Heres the second video with the sub alone. Out of the box. Sounds nasty...

Fixed for you. Just learned how to do this myself. LOL
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Old 11-02-2009, 08:34 PM
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LOLL thanks man. You need to explain tha to me.
I have one more video for you too.LOL

http://www.youtube.com/watch?v=pE3y6Zu141w

thats the sub in the box in the trunk. it sounds good wen its turned up but you hear the noise when its low.
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Old 11-02-2009, 08:36 PM
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Originally Posted by suspeck
LOLL thanks man. You need to explain tha to me.
I have one more video for you too.LOL

http://www.youtube.com/watch?v=pE3y6Zu141w

thats the sub in the box in the trunk. it sounds good wen its turned up but you hear the noise when its low.
The code for it is [ YT ] in front and [ /YT ] after without the spaces between the brackets then just copy anything after the = sign between those. Highlighted in red above.
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Old 11-02-2009, 09:01 PM
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Is there scratching when you pull up on the sub? Hard to tell in your video, but almost sounds like a lifted coil. Does the cone still have full travel? When does it scratch? All the time? Only in one area?
Last edited by DeadlySones; 11-02-2009 at 09:05 PM.
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Old 11-02-2009, 09:54 PM
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Originally Posted by N130Gv2
Is there scratching when you pull up on the sub? Hard to tell in your video, but almost sounds like a lifted coil. Does the cone still have full travel? When does it scratch? All the time? Only in one area?
See thats the weird thing. If i push down on it theres no scratching,if i pull up on it theres no scratching, but when its playing it sounds like...... theres a coin jumping around on a subwoofer with a plastic cone. lol
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Old 11-02-2009, 10:16 PM
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In this video you can only hear the sub noise when the trunk is open. Otherwise it sounds fine. hmmm
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Old 11-02-2009, 11:03 PM
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this is like the exact same issue going on with another forum member (DaVibe)...

my tfone made that noise when it played and it was because the spider assembly became detacted from what looked to be the spacer
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