Hi all,

Hmmm, here is a new/old speaker/voice coil speculation idea, which I don't
think has been covered before in PSN email.

It "assumes" you have a round coil that does reasonably fit the inside
diameter of a, and/or, a pair of round ring neodymium magnets;
and; ~ the total thickness of the neodymium magnets is at least greater than
the thickness of  the coil itself.

You take 2 round ring magnets and simply co-join them N-S-N-S.  The field
where they co-join (S-N) will be quite
intense, and is where the movement of the coil will be most sensitive.  This
is the only real change/addition.

The old voice coil or speaker magnet setups usually have a centered iron
vertical rod straight up through the
center, and had the normal base plate to which it was attached.  Something
similar would be nice to have but
probably not too difficult to "add on" or home brew to the stacked pair of
ring magnets.  I suppose a "base plate" of just
a larger size iron washer could serve to begin with, but probably a square
steel plate with a centered/mounted iron bolt
or whatever could be fashioned to enhance the overall sensitivity to seismic
movement.

I don't really know, but I would think the coil output sensitivity could
exceed that of a single ring neodymium magnet
by perhaps ~ 2x over that of a single ring magnet; and (?) perhaps many
times that of the old single alnico "U" magnet.

In reality...the old round coils will be with us forever....this setup
"might" work a heck of alot better....

Meredith Lamb
Hi all,

Hmmm, here is a new/old speaker/voice coil speculation idea, which I don't think has been covered before in PSN email.

It "assumes" you have a round coil that does reasonably fit the inside diameter of a, and/or, a pair of round ring neodymium magnets;

and; ~ the total thickness of the neodymium magnets is at least greater than the thickness of  the coil itself.

You take 2 round ring magnets and simply co-join them N-S-N-S.  The field where they co-join (S-N) will be quite

intense, and is where the movement of the coil will be most sensitive.  This is the only real change/addition.

The old voice coil or speaker magnet setups usually have a centered iron vertical rod straight up through the

center, and had the normal base plate to which it was attached.  Something similar would be nice to have but
probably not too difficult to "add on" or home brew to the stacked pair of ring magnets.  I suppose a "base plate" of just

a larger size iron washer could serve to begin with, but probably a square steel plate with a centered/mounted iron bolt
or whatever could be fashioned to enhance the overall sensitivity to seismic movement. 

I don't really know, but I would think the coil output sensitivity could exceed that of a single ring neodymium magnet

by perhaps ~ 2x over that of a single ring magnet; and (?) perhaps many times that of the old single alnico "U" magnet.

In reality...the old round coils will be with us forever....this setup "might" work a heck of alot better....


Meredith Lamb