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Old 21st October 2011, 09:20 AM   #791
jzagaja is offline jzagaja  Poland
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New phase plug parts.
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Old 24th October 2011, 06:14 PM   #792
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New driver almost ready, magnetizing left. White adapter for 18sound NSD1095N.
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Old 24th October 2011, 06:21 PM   #793
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The NSD1095N is currently my favorite 1" compression driver. Are you modding the phase plug on it?
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Old 24th October 2011, 06:37 PM   #794
jzagaja is offline jzagaja  Poland
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I mod Polish driver (D800Ti) with Fresnel phase plug and NSD1095N diaphragm. 18sound driver uses hybrid phase plug.
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Old 24th October 2011, 07:38 PM   #795
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Jacek

If thats is supposed to be a Fresnel phase plug then each open section should be of equal area. Somehow that just doesn't look right. Are you sure that eaach opening has equal area?
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Old 24th October 2011, 08:02 PM   #796
jzagaja is offline jzagaja  Poland
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I'm aware they aren't equal. I've used centroids from your paper and maybe in a wrong way.
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Old 24th October 2011, 08:53 PM   #797
jzagaja is offline jzagaja  Poland
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I did typo in the first ring from diaphragm side but all in all 3D print is limited on wall thickness and we must take it into account - this 3D print is rough. No problem with a new one and for example 0.5 inch.
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Old 24th October 2011, 08:56 PM   #798
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Well you need to review the patent again, because the concept of equal areas for all of the channels is critical, just as the concept of a Fresnel pattern also have equal areas. If the ares of the channels are not equal in area and equal in length the the wavefront at the aperature will not be constant, i.e. "flat". This is the central point of the patent.

So if you have three channels then the area of each channel must be exactly 1 / (3 * compression ratio) of the total area of the diaphragm.

The "centroids" tell you the locations for the channels, centroids match centroids, but nothing about their widths. The widths are defined such that each channel has an equal area and covers corresponding Fresnel areas of the diaphragm.

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Old 24th October 2011, 09:01 PM   #799
jzagaja is offline jzagaja  Poland
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[QUOTE=gedlee;2757211So if you have three channels then the area of each channel must be exactly 1/3 of the total area of the diaphragm.[/QUOTE]

Divided by compression ratio.
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Old 24th October 2011, 09:13 PM   #800
jzagaja is offline jzagaja  Poland
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So you have good eyes for details
Compression ratio is 1:3
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