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Sub making noise

I have a 15 inch mtx thunder 7000 sub that I have never really used, when i pulled it out of storage and hooked it to an amp, a sound was coming from the dust cap that sounded like something was hitting it, upon placing my finger on the dust cap, the noise ceased. the movement of the cone seems intact, does this mean the speaker is blown?

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  • cedwards665 Dec 30, 2008

    Thank you for your response, I tried shaking it but heard no noise, I tested the speaker with a ohm meter and it read 1 ohm, does this mean that it is not blown? I am going to do some surgery on the dustcap to see if something is loose behind it. When I hooked it to an amp that I have on 2 12" subs, the speaker seemed to play fine if you hold the dustcap, although the output is very weak. Thank you for giving me some direction as to how to check this out,,,, I am glad there are smart people like you in the world


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As dumb as it sounds, shake the speaker up and down with the speaker facing down. If the sound is there, there is possibly something inside the voicecoil that has come loose over time. If aetheitcs is important, stop here. The dust cover just keeps the voice coil from rusting. Use a box knife and cut a ****. Push one side of **** slightly inward. Prop it apart if you can. Shake till whatever is in falls out. A touch of silicone across cut will reseal.

Posted on Dec 28, 2008

  • bob collins
    bob collins Dec 31, 2008

    1 ohm doesn't mean the speaker is blown because that isn't how it works. That being said, the reason it sounds weak is probably because it isn't mounted and is required to be to sound good.


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