Choosing form of neodym magnets for diy ribbon tweeter. Need help! - diyAudio
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Old 27th November 2012, 07:23 PM   #1
Flv is offline Flv
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Question Choosing form of neodym magnets for diy ribbon tweeter. Need help!

Hi all, i want to make a ribbon tweeter or small midrange speaker.
My budget for magnets is only around 30$ ...
I can't choose what is better to get on ebay...
I looking at:
216pcs 5mm 1/5" 0.2 inch Cube Square Neodymium Strong Magnetic Fridge Magnets | eBay

216 5x5 mm cubes - overall it has best mass/volume for price ratio.
I can stack this small cubes in different configurations to test some...
Or better buy a 4 big long magnets for pair of tweeters?
Like this:

New Super Strong Neodymium Block Magnets 100mm x 10mm x 5mm N35 Grade Rare Earth | eBay

Or maybe better to get block of 500 small 5x5x1 mm magnets?

500pcs 5mm x 5mm x 1mm Blocks Rare Earth Neodymium strong fridge Magnets N35 | eBay

With 500 pcs. i can make really long ribbons about 62 cm with ore row or 31 with two...

Anyone has an experience with stacking small magnets? Or maybe even cylindrical?

Is 1 mm thickness is enough? I, generally, don't care about sensitivity beause i want make bi-amp system...

Last edited by Flv; 27th November 2012 at 07:52 PM. Reason: misprint
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Old 27th November 2012, 10:02 PM   #2
Paul W is offline Paul W  United States
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Go with the long ones. The small blocks would repel and attract in ways that would quickly discourage you.
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Old 27th November 2012, 10:42 PM   #3
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hey Paul don't you visit he HTguide?
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Old 27th November 2012, 11:41 PM   #4
Paul W is offline Paul W  United States
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Yes I do, but have not posted any new project there for some time.
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Old 28th November 2012, 02:49 PM   #5
fperra is offline fperra  United States
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Here is another source for magnets:
K&J Magnetics - Products
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Old 28th November 2012, 03:11 PM   #6
tyu is offline tyu  United States
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Thanks for the magnets info....lot of $$$
My Apogee stages must have 1k just in magnets....
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Old 28th November 2012, 05:39 PM   #7
Flv is offline Flv
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Have anyone used 3 mm thick N35 magnets? (50x10x3)
Can't choose between 3 mm and 5 mm (50x10x5)
15 cm ribbon with 3mm magnest vs 20 cm ribbon with 5 mm magnets, all for around 30 bucks...
I want use ribbon about 2 cm width. Don't know how to calculate sensitivity, around 86 db is enough for me... Is 3 mm neo magnets capable of this?
And is the sound quality depends from sensitivity? Or it's just the power efficiency? And with more powerful amp there is no difference?
Is it any big difference between 10, 15 or 20 cm ribbon in overall sound?
Have anyone expirience with more "fat" shape of ribbon, like 10x4 cm or so...
How does depends ability to play lower frequences from lenght of ribbon?
10x2 cm usually cuts from 3-5 khz, can 15x2 or 20x2 cm ribbon go lower? From 500 hz - 1k ?

What do you choose?
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Old 29th November 2012, 02:36 AM   #8
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by tyu View Post
Thanks for the magnets info....lot of $$$
My Apogee stages must have 1k just in magnets....
It uses ferrites , a tenth of the cost of Neo's ..
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