A speaker cone moves as the result of 2 opposing magnetic forces. Those
forces are: (A) from a permanent magnet field; or (B) from a electro
magnetic field. Thus a strong field from a permanent magnet requires less
field from the electrical generated field to move the cone the same amount
of excursion.
73
Bob K4TAX
----- Original Message -----
From: "James Duffer" <dufferjames@hotmail.com>
To: <RMcGraw@Blomand.Net>; <tentec@contesting.com>
Sent: Monday, January 21, 2002 4:01 PM
Subject: Re: [TenTec] Ten-Tec External Speaker
>
>
>
> >From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
> >To: tentec@contesting.com
> >Subject: [TenTec] Ten-Tec External Speaker
To: <tentec@contesting.com>
> >Date: Mon, 21 Jan 2002 13:15:32 -0600
> >
> >Speaker debate: I stirred the mud first so I'll stir it some more.
Slosh!
> >
> >Typically speakers with large magnets are more efficient, i.e. possess
> >greater sensitivity, than ones with small magnets. This is contrary to
one
> >message posted earlier that stated a speaker with a small magnet required
> >less power.
>
> Why is this contrary? Please explain why moving identical voice coils in
a
> strong magnetic field versus a weak magnetic field (from the permanent
fixed
> magnets) requires less power?? Curious minds wants to know.
>
> SNIP
>
> 73, Jim, wd4air
>
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