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Old 22nd September 2011, 09:50 PM   #141
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Quote:
Originally Posted by tmblack View Post
The bass of the Apogees is much better than the Magnelanars, stronger magnets would increase the sensitivity or one can use smaller Neo magnets.
What are typical sizes of the Pastiform magnets?
This is a picture of the Magnepan Tympani bass panel.
The magnets are about 8-9 mm wide.
The magnets for the tweeter/midrange is like the other picture.
Click the image to open in full size.
Click the image to open in full size.
https://lh6.googleusercontent.com/-k...6/IMG_0998.JPG
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Old 25th September 2011, 09:49 AM   #142
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Sorry for the ignorance but how do you determine how low one of these designs can go?

I dont know anything about these types of speakers. I was looking at maybe doing a very tall ribbon tweeter but now am starting to wonder about these for my next build.

Only thing close to this I have ever heard is a ESL speaker from Martin Logan. How is the back wave controlled on these types of speakers?

I have restrictions in the size I can build but 22" wide x 48" tall is about as big as I want to go. If thinner than I can go taller but just have to learn what does what according to size.
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Old 29th September 2011, 05:34 AM   #143
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Quote:
Originally Posted by tmblack View Post
The bass of the Apogees is much better than the Magnelanars, stronger magnets would increase the sensitivity or one can use smaller Neo magnets.
What are typical sizes of the Pastiform magnets?
Just remember that stronger magnets can kill the wanted high Q in the bass. It is not very easy to end up with both high efficiency and good bass extension. Using Neodynium magnets allows you to use smaller magnets but it will be expensive.

The Plastiform magnets used by Magnepan for most bass drivers measures: 1/4 x 1/16 x 55 inches.

Quote:
Originally Posted by tmblack View Post
Why not just use B&G Neo 8 ribbon driver or Neo 10 driver instead of DIY?
If you want to replace pair of Magneplanar mid and tweter, you will need 12 pieces of Neo10 and 32 of Neo3-PDRW in order to reproduce the frequencies ~150 Hz and upwards. It will cost about $3500. You can buy a pair of used Magenpan MG 3.6 for that kind of money and they will go from ~35 Hz and upwards.
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Old 29th September 2011, 11:02 PM   #144
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why not build full range planar size 60 x 40 cm using 370 neos size 50 x 12.7 x 3 mm, cost a lot less than $3500 and a lot smaller too, easy.
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Old 24th October 2011, 04:20 PM   #145
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Hi...
This topic about planar speakers are cool and interesting.
So what i have in plan...
Just for testing purpose i want build small planar with one neo magnet
from hard disk.
Is this magnet quite good for small speaker ,for example 10x10 cm..?
when i read this topic i see that is for good sensitivity i must have covered
whole back surface with magnetic field,right?
So i have in plan put this magnet on iron net .
What you think about that.
For membrane i plan to use water proof folium for floors and add cooper
wires on this folium.

Any suggestion will be great...
cheers!
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Old 26th October 2011, 10:09 PM   #146
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You will find all you need in my photos Rubendev, I wouldn't use copper wire but aluminium tape you can cut this to different widths the smaller the better and I would also use 6um mylar A. This is best for sensitivity. The lighter the membrane the better. I use 50 x 12.7 x 3mm neo magnets any larger ones are too dangerous, especially if you use a lot like I do. I am in the process of building my latest design. 4' X 2' using 816 magnets in 6 columns of68 magnets on each speaker, I am also using 6um mylar A for the diaphragm and 2.25 mm wide aluminium tape cut by hand as I don't think you can buy aluminium tape this wide!! when I am satisfied with latest design I will upload some more pictures. Wish me luck!
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Old 27th October 2011, 04:12 AM   #147
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Hi Henry,

I've been following your thread with great interest. I've heard that planar speakers are really power hungry. What do you think?

Wachara C.
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Old 27th October 2011, 09:23 AM   #148
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not really especially compared to ESL speakers. I have no problems using valve amps of low output. The only problem I have is trying to get my new 9.2 ONKYO Amp set up properly! There are so many different settings, I think it will take the rest of my life to really sort it out. I am too busy at the moment. With my latest rebuild and cutting the foil into 2.25 mm strips, I'm also in the process of designing and building full range planar headphones, so have quite a bit to do. If my rebuilds using the thinner tape and mylar are successful, I may have to rebuild my rebuilds, so I have plenty to keep me active. I only hope I've got enough energy to carry on.
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Old 27th October 2011, 10:04 AM   #149
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This is very popular in Denmark. Here is a link with lots of pictures. It in danish, but the picutres tells it all

http://www.hifi4all.dk/forum/forum_p...ler&PN=0&TPN=1

Last edited by Kjeldsen; 27th October 2011 at 10:10 AM.
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Old 28th October 2011, 02:34 AM   #150
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I come across some aluminum coated Mylar. Do you think that there is any easy way to etch away some unwanted aluminum. I think if it is possible to do so, then it'll be a lot better and easier than having to glue the aluminum foil on the Mylar.

Wachara C.
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