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Old 27th May 2009, 05:01 PM   #121
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Hi Vaughn,

After the meeting, four other friends were rushing me for the kits.

It's a really fun meeting and we were impressed at how good a DIY headphone could sound.

About the loud speakers, I would really need a lot of help. I will start a new thread soon and hope that you guys can help me out.

Wachara C.
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Old 28th May 2009, 07:25 AM   #122
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Just for the fun of it, I will make another pair of headphone with the stator pattern similar to Philippe's. The stator and diaphragm will be much smaller than my previous ones. It'll probably be 10cm x 7cm.

Here are the previews of it:

Click the image to open in full size.

Click the image to open in full size.

Wachara C.
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Old 28th May 2009, 12:29 PM   #123
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Hi, Wachara

dont' you think it will be better
to turn the direction of the slots 90,
because then the distance to the frame
is much shorter as it is now?

Regards
Frank
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Old 28th May 2009, 01:17 PM   #124
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Quote:
Originally posted by frank ziel
Hi, Wachara

dont' you think it will be better
to turn the direction of the slots 90,
because then the distance to the frame
is much shorter as it is now?

Regards
Frank

Hi Frank,

Thanks for your comment. I've never thought of that, actually.

I'll think about it.

Wachara C.

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Old 29th May 2009, 04:59 PM   #125
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@Philippe:

Hi Philippe,
can you make a little experiment with the two
different electrodes you made?
I think this will help us to understand why the ones with piano-wire sounds better than the ones with holes!
Lite a cigarette (pipe, cigar)
Take the elektrodes one after the other in the same distance (10cm)
in front of your mouth and then blow smoke gentle (!) at them.
Best you sit in front of a mirror, that you can see what happens
(or what comes out) on the other side.
Don't inhale ...
Regards Frank
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Old 30th May 2009, 05:55 AM   #126
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I come to wonder if there is a significant difference in sound produce from round, oval, or rectangular shape stators and diaphragm? Has anybody really done the test?

Wachara C.
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Old 30th May 2009, 02:13 PM   #127
Kontra is offline Kontra  Russian Federation
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Smile Round and rectangular

I did experiences with large and small loudspeakers. (1000 mm * 800 mm and 50 mm radius, a rectangular, round)
The round loudspeakers has one resonance, other form of a loudspeakers TWO resonances.
The more resonances at a loudspeakers, the it is worse.
I am sorry for my English.
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Old 30th May 2009, 03:51 PM   #128
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Default Re: Round and rectangular

Quote:
Originally posted by Kontra
I did experiences with large and small loudspeakers. (1000 mm * 800 mm and 50 mm radius, a rectangular, round)
The round loudspeakers has one resonance, other form of a loudspeakers TWO resonances.
The more resonances at a loudspeakers, the it is worse.
I am sorry for my English.

Hi Kontra,

Do you mean that round shape is better than rectangular?

Wachara C.
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Old 30th May 2009, 04:32 PM   #129
Few is offline Few  United States
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Quote:
The round loudspeakers has one resonance, other form of a loudspeakers TWO resonances.
Actually, in both cases there is one fundamental resonance, and a (theoretically infinite) number of higher frequency modes. The higher frequency modes generally have more nodes than the lower frequency modes, although the details depend on the rectangular diaphragm's ratio of the length to width.

For some nice animations of the circular membrane's modes, see this site. The modes of the rectangular membrane can be seen here.
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Old 30th May 2009, 05:33 PM   #130
vaughn is offline vaughn  United States
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Quote:
Originally posted by Few


Actually, in both cases there is one fundamental resonance, and a (theoretically infinite) number of higher frequency modes. The higher frequency modes generally have more nodes than the lower frequency modes, although the details depend on the rectangular diaphragm's ratio of the length to width.

For some nice animations of the circular membrane's modes, see this site. The modes of the rectangular membrane can be seen here.

Thanks for that Few, those are some very interesting simulations...

I don't know that we'll ever know without some fancy test equipment what the best shape is
for a diaphragm. For some reason I think it is neither circular, ovoid, rectangular, etc. but
something else entirely not based on simple geometry. Or perhaps to think laterally use a traditional
geometric shape but somehow be able to vary tension on the diaphragm in a fixed (or even dynamic) way
that would allow you to suppress/cancel certain resonances. The problem (at least in the past) with making
a more complex shape is in the "economy of production". It has been cheaper to make circles, ovals and rectangles than a complex shape.

It seems that the top electrostatic headphones don't rely on one standard shape; The Stax Omega has a circular
diaphragm and the Sennheiser HE60/90 have oval ones. The new crop of electrostatic headphones coming out of China seem to be all using oval diaphragms.
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