Noob question about speaker coils.

[neutron7]

I have been looking in to some coils for something (A variable electromagnet which is powered from an amplifier) anyways i am looking at the various gauges of wire and DC resistance for a certain length of wire.

Now i look at some speaker specifications, and see DC resistance of 4 or 6 ohms or whatever even on high powered woofers. This confuses me a bit because speaker coils are usually just 200 turns or so in one layer.

It seems to me that with a bigger speaker (and gauge of wire) that would give a very low resistance.

I would like to be able to make an electromagnet which looks as much like a speaker as possible to the amplifier, but the coil and magnet are both fixed, (it will be vibrating a metal part for an experimental music instrument project)

Is the wire they use more resistive than normal copper "magnet wire" ? otherwise i am not sure what could be going on.

thanks for any help you can give
Neut

 

[godfrey]

It's very thin wire. (small diameter)

 

[Enzo]

You could wind your own, or you could take apart some old relays and use their coils complete with pole pieces.

 

[neutron7]

You could wind your own, or you could take apart some old relays and use their coils complete with pole pieces.

thing is relays take sometimes thousands of coils to get a couple of ohms DC resistance i want to get very poweful push like a speaker.

 

[Enzo]

Well if you want power, there are shakers:

Parts-Express.com: Aura Pro Bass Shaker | bass shaker transducer tactile transducer butt shaker seat shaker gift2009

And a lot of places sell surface transducers that "turn any surface into a speaker."

 

[neutron7]

Heh 🙂
well i have been experimenting, and the best thing i found so far is the double coil from an old electric bell. of course i need 6 of them and cant find any more 🙂