The magnets are held on to the tweeter hole
in the MDF plate by their own magnetic force, and the fact
that you have long strips of metal plates covering the sides
of the hole (don't you....???!!), thus the north pole of the
magnets are on one side and the other side holds the south
pole magnets.
This is done so the top row of magnets on
the woofer section of that speaker must have the same polarity
as the row of magnets in the tweeter section closest to the
woofer section (sounds wierd but it's simple, don't worry
on what exactly is the N and the S polarity, just assume that
one is the N and the other is the S and work consequently
out of that assumption. When this is done, you are thus sure
that the speakers are working in fase.
The magnets are arranged as shown in the
figure. In my case, as in the Danish original project, two
magnets are placed on top of each other to generate a stronger
magnetic field. The distance between the magnets on the same
side is obvious, because they will not stay any closer than
they want to (their magnetic field wants to).
The personal dimensions involved will depend
on the material you use, just make the distances such as to
have a 1 mm. distance between the tweeter membrane and the
magnets, on each side.
This diagramme shows the returning conductors
made out of the aluminium material , I chose to use wires
and make the tweeter conductors not as wide as the original
project. You experiment and find out.
A list of materials
needed.
The construction recipe
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