Speaker Question
Speaker Question
I have a dead one. It's a 1-15" Ampeg cabinet and I am getting nothing out of it. My question is, should it be a closed circuit from terminal to terminal? I did a continuity test on it and it's open. Not sure I have a firm understanding of how speakers work, though. Or electronic circuits. lol.
Re: Speaker Question
It should read whatever ohms the speaker is rated for...give or take a few ohms.
Rebel Yell
- Bubba
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Re: Speaker Question
Connect a 9v battery between the terminals. If the cone moves then the speaker is probably ok.
Haggard Musician
Re: Speaker Question
But on a continuity test should it be a closed circuit? I have the cabinet with me at work and asked an electrician to just do a continuity test. Maybe I should have had him test the ohms?
- Bubba
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- Joined: Wed Jan 04, 2017 2:45 pm
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Re: Speaker Question
When you say you blew a speaker, did you break the cone or burn out the coil? If the coil is broken then it won't pass any current. Basically, a speaker is a coil of wire stuck to the bottom of a paper cone. The coil is immersed in a strong magnetic field. When you pass a current through the coil it produces movement which is translated by the cone into sound waves. If the wire is broken then there is no current flowing and no movement. Sorry if you already know all this.
Haggard Musician
Re: Speaker Question
This is what I was looking for. This speaker isn't doing anything. No sound at all. I didn't pull the grill at rehearsal last night so I didn't actually check movement but there was no sound.Bubba wrote: ↑Thu Mar 02, 2017 3:55 pmWhen you say you blew a speaker, did you break the cone or burn out the coil? If the coil is broken then it won't pass any current. Basically, a speaker is a coil of wire stuck to the bottom of a paper cone. The coil is immersed in a strong magnetic field. When you pass a current through the coil it produces movement which is translated by the cone into sound waves. If the wire is broken then there is no current flowing and no movement. Sorry if you already know all this.
And it sounds like on a functioning speaker if I do a continuity test from one terminal to the other it should be a closed circuit right? This is my question.
Re: Speaker Question
It should have continuity, but at a specific resistance. What Bubba said is also true - a coil can pass current but not move the paper. With the battery test you can easily see the cone jump back and forth if all is well. If you use a "beep" continuity tester, that will show you continuity, but only tell a tiny piece of the whole picture.ez_willis wrote: ↑Thu Mar 02, 2017 4:47 pm
This is what I was looking for. This speaker isn't doing anything. No sound at all. I didn't pull the grill at rehearsal last night so I didn't actually check movement but there was no sound.
And it sounds like on a functioning speaker if I do a continuity test from one terminal to the other it should be a closed circuit right? This is my question.
Rebel Yell
Re: Speaker Question
I think I know what you mean. I'm probably not explaining it correctly. No matter what, if the circuit isn't closed between the two terminals the speaker is dead. Correct?
Re: Speaker Question
Yes, I think that would be a problem no matter what shape the cone is in.
Rebel Yell