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Old 24th February 2013, 09:22 AM   #241
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The neo's you have are 1/3 the thickness of the ferrite's and also nearly 1/5 the volume as well for each magnet.
This could be why the big difference in the sensitivity!!!

FWIW

jer
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Old 24th February 2013, 09:53 AM   #242
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Now I think it's time to clear some physical facts before You give unqualified tips to people.

There are significant properties that makes neo magnets much better.
One of them (and that is the major) is that You WILL get higher efficiency from the speaker using them
The plain physical fact is that they have MUCH higher magnetic flux then ferro magnets.

Jamesbos... You really need to rethink Your magnetic layout on Your speakers as You do it ALL WRONG with magnetic collapse as a result.

Cheers!
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Old 24th February 2013, 10:57 AM   #243
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would you care to elaborate on whats wrong with his layout.cheers
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Old 24th February 2013, 11:07 AM   #244
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First of all, You should never ever put the opposite poles side by side so that they make contact.
That will ruin the whole design idea as the magnetic flux will direct itself immediately to the magnet touching next to it.
So N should NEVER EVER touch the S on the same plane.

Cheers!
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Old 24th February 2013, 11:10 AM   #245
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I think this is the basic that all should know and I give You this tip for free because I care.

Cheers!
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Old 24th February 2013, 08:29 PM   #246
gootee is offline gootee  United States
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Good point. Several people have suggested that a gap should be left between the columns of magnets. I think they had other reasons, ie either to leave area for air to move or because it would enable the use of fewer magnets.

But it seems reasonable to believe that if the N and S were touching, the field would almost act like there was a short, there, and not as much would extend out to the mylar.

So that leads me to believe that for a particular distance to the mylar, there should be an optimal spacing for the N and S columns, that would maximize the field stength in the plane of the mylar, where the foil is.

Last edited by gootee; 24th February 2013 at 08:37 PM.
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Old 24th February 2013, 10:48 PM   #247
WrineX is offline WrineX  Netherlands
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yeah always leave space in between the North and South poles, this is where ur foil runs on the mylar, this is the reason why magnepan uses allot of rows of small magnet strips in the lenght of the speaker so you can run allot of foil or wire in the gaps. this layout is not verry usefull when you have big magnets, take another look at the epsilon layout everywhere the foil should run there must be a gap between 2 magnets atracting one another, but dont let them touch eachother. the closer together the higher the fields strength. remember that the sound needs to go out of the speaker to so dont go smaller then gap of 1 mm (and be sure there are holes in the metal in this gap or the sound just bounces against it instead of going into ur room). for instance if you put an esl against the wall all ur low end and allot of the Sensitivity will be gone!

So the gap is importend for 2 reasons.

Try to create a layout where you get the most length of gap out of ur magnets, so you can use as much coil so ur mylar is driven as uniform as possibble.


arange magnets like NORTH SOUTH NORTH SOUTH NORTH SOUTH ETC between north and south you let the foil run up the speaker and with south north back down again just repeat it.

dont mess that up or some of ur foil will be playing out of phase canceling the other sound so you wil end up with nothing, or far less.

Last edited by WrineX; 24th February 2013 at 10:56 PM.
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Old 25th February 2013, 02:16 AM   #248
gootee is offline gootee  United States
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At least the wire/foil placement versus the magnet poles can be easily verified, by using a piece of wire and a DC power supply (with a resistor in series).
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Old 25th February 2013, 07:38 AM   #249
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I have to rebuild all my neo speakers as well, now I am using 3 mm wide tape, more pain for the old back. I know neos are stronger than ferrites, I have the blood blisters to prove it!! After building over 60 full range planars of all sizes and layouts I think I know what I am doing by now. The secret to sensitivity is using all the magnet area you can. Which I aim to do with all my re-re-builds. I am confident I will increase sensitivity quite significantly with the same number of magnets. I did build one with gaps between the magnets, but gave up the idea, as the magnets were unstable even with super glue, and there wasn't any improvement in sensitivity, worth the extra work involved. As I said the 60 x 40 using ferrites is 8 Db more sensitive than the large 4' x 2' one using neos, which I already know are much stronger. The important difference is in the foil layout. The opposite is true when you just use the normal layout of putting the foil over the intersection of the N & S. If this makes me unqualified so be it!!
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Old 12th March 2013, 09:28 AM   #250
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Default some more reduced pictures

some more pictures with new covers, canvases quite cheap.
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