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Old 31st May 2014, 09:31 PM   #1
Elias is offline Elias  Finland
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Default Master Nagaoka Tetsuo explorations on matrixed single stereo speakers

Hello and how do you do !

A few years ago I presented the theory and operation of matrixed single stereo loudspeaker
Stereophonic Sound from a Single Loudspeaker


Just recently I discovered that late Nagaoka has left us with a huge heritage of single stereo matrix loudspeakers
Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.


Basically he used two kind of matrixes. For 3 and for 4 elements.

The 4 element matrix looks like this:
Notice that this is MS matrix. The front elements sum acoustically to form L+R signal.
Click the image to open in full size.
hkjunk0.web.fc2.com/hobby/audio/matrix_db/matrix02.jpg


And the 3 element matrix is like this:
We can see it is the famous x=0.5 matrix (Notice though the left amplifier channel negative terminal is left unconnected, possibly to avoid a ground loop?)
Click the image to open in full size.
hkjunk0.web.fc2.com/hobby/audio/matrix_db/matrix03.jpg


{HIRO}'s Website!! - matrix_db1


(edit: those hkjunk images are pain to see online, just copy the link to an empty window)
.
Attached Images
File Type: jpg matrix02.jpg (25.3 KB, 274 views)
File Type: jpg matrix03.jpg (15.7 KB, 123 views)
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Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets

Last edited by Elias; 31st May 2014 at 09:36 PM.
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Old 31st May 2014, 09:43 PM   #2
Elias is offline Elias  Finland
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Nagaoka MX-1

First such a matrix single stereo speaker was MX-1, using 4 element matrix

Click the image to open in full size.

from here:
2009?8? - COLKID?????


Construction and the matrix connection:

Click the image to open in full size.

from here:
スピーカー:オーディオ体験情報



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Old 31st May 2014, 09:51 PM   #3
Elias is offline Elias  Finland
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Looks like MX-1 was quite popular, at least in Japan.


Click the image to open in full size.
from here:
’キ‰ェ“S’j‚ウ‚


Click the image to open in full size.
from here:
Whatnew(‚ォ‚ワ‚ョ‚“‹L)


Click the image to open in full size.
from here:
ƒXƒeƒŒƒI


Click the image to open in full size.
from here:
2????????? | ???????????? - ?????


Click the image to open in full size.
from here:
http://itsouken.exblog.jp/19595281/


.
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Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets

Last edited by Elias; 31st May 2014 at 09:53 PM.
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Old 31st May 2014, 09:58 PM   #4
Elias is offline Elias  Finland
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MX-1 was published already in 1980 in a book "Original speakers work of 45 Nagaoka Tetsuo" (google translation.)


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Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets
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Old 31st May 2014, 10:06 PM   #5
Elias is offline Elias  Finland
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Nagaoka MX-10


There was an improved version of MX-1 called MX-10, with more bass output apparently using some sort of reflex port extension hidden in the base.
The 4 element matrix was the same as in MX-1.


Click the image to open in full size.
Click the image to open in full size.
from here:
.page besides SPI sound plaza Ida / handmade speaker basic lecture (6)/wonderful speaker.page



Click the image to open in full size.
from here:
作品集2


Click the image to open in full size.
from here:
FE103-Sol???????? | Phile-web??????


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Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets
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Old 31st May 2014, 10:33 PM   #6
Elias is offline Elias  Finland
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Interesting is the Nagaoka MX-15 speaker with 3 element matrix. Matrix is x=0.5.


Click the image to open in full size.
http://stat001.ameba.jp/user_images/...2843418391.jpg
from here:
???????(MX-15)???????????????


Click the image to open in full size.
hkjunk0.web.fc2.com/audio/speaker/mx-15/mx-15_03.jpg
from here:
{HIRO}'s Website!! - mx-15


Click the image to open in full size.
from here:
MX−15もどき3本マトリクススピーカーの製作 4 / 加藤ちゃんの日記



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Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets
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Old 31st May 2014, 10:36 PM   #7
Elias is offline Elias  Finland
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Now, obey the Master. Build these speakers. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.


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Liberate yourself from the illusion of two speaker stereo triangle
Dipole Bass vs Monopole Bass Stereophonic Sound from a Single Loudspeaker 3 Speaker Linear Stereo Matrix Wavelets
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Old 1st June 2014, 02:53 AM   #8
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Very cool. Thanks for sharing that.


Last edited by Nelson Pass; 1st June 2014 at 02:57 AM.
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Old 1st June 2014, 03:15 AM   #9
xrk971 is offline xrk971  United States
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This does look very interesting and easy to try. I finally have the "lunch money" class A/B TDA7297 amp and a bunch of full range drivers lying around. Just need a box - foam core will do. Can they all share the same volume?

Can someone describe qualitative listening impressions of what they sound like?
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Old 1st June 2014, 03:20 AM   #10
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neat.

in post #1, the 2nd picture. Wouldn't the center be 6db too loud?

You could use a pot around it, but it may not work well unless the speaker has a flat impedence.

Norm
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