I have a question I'll try to make brief, I sold a JL Audio 10" subwoofer on ebay in mint condition and worked perfectly fine, the buyer opened a dispute saying he bench tested the speaker and one of the voice coils were blown, he wanted to keep the speaker but with dispute he was forced to send it back, When I received my subwoofer back there is a 2.5" hole along the foam of the cone and more then half the cone is unglued, it looks to me like the foam is dry rotted. This clearly isnt the speaker I sent him so I had to appeal his dispute, since I now believe he still has my speaker and got his money back and I'm stuck with a beat up speaker. He never stated in his dispute that the cone was damaged in anyway, I am under the impression that with the gapping hole in the cone he wouldn't of been able to bench test it to even find out the voice coil was blown, am I correct?? And if anyone knows what that kind of damage does to the subwoofer?? To me it looks like my perfectly good subwoofer is perfectly shot now. Can anyone help me??
This has somewhat happened to me before, If you have taken any pictures of it when you are trying to sell it, see if you have any of the area the number is located, and try to zoom in and touch it up so it is able to read, if you have a picture of it, but not able to read it, I'd be more than happy to auto adjust it for you to get him. Otherwise, like the guy before me said, its gonna be a loss.
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3 Responses to “Can you bench test a subwoofer with a tear in it?”
There's nothing about the cone condition that would prevent someone from doing testing on the voice coils. You can test voice coils with a multimeter. Usually blown voice coils will end up in one of two conditions: open or shorted.
If you have a 4-ohm voice coil, and test the DC resistance between the terminals using a multimeter, you'll usually get a resistance reading between 3.2 and 3.7 ohms. A shorted voice coil will give you a resistance reading under 1 ohm; an open coil will show extremely high or infinite resistance.
With the cone in the condition you're describing, the woofer is effectively worthless. It would produce more distortion than bass.
Good luck; I hope you're able to prevail against this jerk.
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The above answer is correct and unfortunately if you did not record the serial number of the sub you sold then there is no way for you to prove that the sub that was returned is a different sub. Sorry to say that you may be stuck with the loss.
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This has somewhat happened to me before, If you have taken any pictures of it when you are trying to sell it, see if you have any of the area the number is located, and try to zoom in and touch it up so it is able to read, if you have a picture of it, but not able to read it, I'd be more than happy to auto adjust it for you to get him. Otherwise, like the guy before me said, its gonna be a loss.
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