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well one day i got bored so i went an opened up some new subs, i hooked 1 12'' infinity 12.1d to my stereo... ( that jvc with 460watt power ) and like i was testing the sub... and its goes " ZZZZZTTTT " its like something is hitting it, but i checked an nothin hitting it.. so what does that mean??

 
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Check to make sure the tinsel leads aren't hitting it when it is playing

 
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and if they are??.. what i do..?

 
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Try and very slightly bend em outward. I had a similar problem with 6x9's a few years back. SO ANNOYING!!

Hope this helped.

 
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could be a dustcap coming loose and buzzing, too.

are you hooking up a car subwoofer in a home environment?

 
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yeah it was connected to my stereo... i only did that to check it to make sure it works cuz i bought it off ebay...

 
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id expect the buzzing at high excursion, then.

not a guarantee of it doing that in the car.

maybe, but not neccesarily.

 
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do you have a sub box?
if it is, your probally leaking air.
to stop that, add some poly-fill stuffing in it to stop the air flow.
+ your subs will sound alot better.

http://www.crutchfield.com/S-SP8XB97...&avf=N&search=

 
Rep Power: 338

polyfill doesnt help a leaky box.

9 times out of 10 a leaky box is caused by air leaking from around the woofer. my favorite fix for that is gorilla snot (strip caulk), weatherstripping works in a pinch as well.

the other time a leaky box is caused by poor construction, and jsut needs a bead of silicone around all the edges to fix.

good call though, if the buzzing noise isnt being emitted from teh subwoofer itself, not coming from behind the dust cap, then its definitely posiible its a leaky box

 
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nawh.. its not even in a box yet... i just took it out of the box an got some speaker wires at radioshack an then hooked the sub up to my stereo..

 
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Where is it mounted then?

You need a box, it might cause a rattle if its not in a box

It is not good to run it off deck power either

 
Rep Power: 338

not in a box...in a home....powered by a home theater amp...

yep, i think we found the source of the buzzing!

your woofer is fine.

 
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its mounted nowhere.... its on top of the box...lol... but yeah if you guys say thats the problem then ill try to get a box for it and then see wassup... thanks..

 
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might have burned a voice coil..

 
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hmm...ill try to check it out..

 
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well does anybody else have any other suggestions tho?

 
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if you are still running them free air then get a damn box...i'm sure the sub will make nasty rattling sounds if run free air...

 
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polyfill only makes a smaller box seem bigger, and use PL-400 floor adhesive to seal the joints when you build a box,,,,,,that shi is like steal when it sets.