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Old 4th March 2011, 06:12 PM   #111
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I don't agree with your summation, and to prove the point I have turned the right side speaker around so the back is facing the front . Have also reversed the leads so they are in phase.Both sides are of equal volume so it still is a dipole. So I don't think I have to space the magnets. Unless I am missing something due to my lack of technical nohow. I only use my ears, as this is the only measuring equipment I have!!
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Old 4th March 2011, 06:19 PM   #112
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No gap between the NS interface but gaps between the columns as the NN would repel each other. So you have no choice unless you glue the magnets in position , which I do not and have no plans to.
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Old 4th March 2011, 10:45 PM   #113
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Quote:
Originally Posted by Baldin View Post
No gap ... I think what Henry means, is that the magnets are placed end to end with no gap, as one unbroken line .... there of course need to be a gap between the (long) rows of magnets ...
Best regards Baldin
Look here: http://i.imgur.com/VycM7.jpg

A bit more gap between magnets shouldn't be totally wrong...
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Old 5th March 2011, 12:19 AM   #114
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you would probably lose sensitivity with a bigger gap as you would have either cut down the number of magnets or make the cut out larger.I shall have to try it with the magnets I have removed from the push pull designs I am rebuilding as single membrane dipoles. As I have found out that there is hardly any difference in the sensitivity, between single membrane dipoles than push pull dipoles. Certainly not worth doubling the magnet count. Even with the 2 membranes.
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Last edited by JAMESBOS; 5th March 2011 at 12:22 AM. Reason: mistake
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Old 5th March 2011, 08:05 AM   #115
Baldin is offline Baldin  Denmark
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Quote:
Originally Posted by JonasKarud View Post
Look here: http://i.imgur.com/VycM7.jpg

A bit more gap between magnets shouldn't be totally wrong...
Ahh .... no that is not right .....
Placing the magnets NS right next to eachother, will loose big amounts of field "energy" where you would have wanted it ... if you make a FEMM sim I'm sure you'll be able to see that. The field will sort of be creeping from one magnet to the other very low over the magnet surface, and not where the voice "coil" is ....
The amount of neo magnets you use, should make up an enormous sensitivity, but I would gess it does not.

Yes it will be working like a dipole, as there is actually some air flowing to the other side, but the unblocked area to blocked area ratio is quite small.

Henry try to do it like the attached drawing suggest ..... I'm sure you will get an improved result
/Baldin
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File Type: jpg 001.jpg (246.2 KB, 435 views)
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Old 5th March 2011, 12:54 PM   #116
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Default Help with coil wiring?

Can any of you guys show a diagram of how the
aluminum coils would run between magnets,for instance
do you start with left side being + on the outside of the
first row of magnets or on inside,also should
the sencond coil which is - run between magnets start
from the right side to keep the current flow correct.
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Old 5th March 2011, 01:28 PM   #117
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Here is a drawing showing how it´s to be done with 2 lines in each gab.
[IMG]Click the image to open in full size.[/IMG]

båndsei
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Old 5th March 2011, 02:11 PM   #118
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Quote:
Originally Posted by båndsei View Post
Here is a drawing showing how it´s to be done with 2 lines in each gab.
[IMG]Click the image to open in full size.[/IMG]

båndsei
I am not sure I understand the right side of the diagram is that
a seperate tweeter wiring.
Thanks,
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Old 5th March 2011, 02:28 PM   #119
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Yes you are right.I have build a 2 way planar.You can see more in my tread"diy planarspeakers"

Båndsei.
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Old 6th March 2011, 02:06 PM   #120
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Quote:
Originally Posted by båndsei View Post
Here is a drawing showing how it´s to be done with 2 lines in each gab.
[IMG]Click the image to open in full size.[/IMG]

båndsei
Hi bandsei
In the picture it looks like + & - overlap on one side would that
not short out the circuit, or is it just feed down to the bottom
and terminated without touching.
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