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Old 28th November 2011, 07:46 PM   #861
jzagaja is offline jzagaja  Poland
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You need gently knock out with a broomstick and remove glue residue by wetting in acetone an hour or so. I'll ask Autotech for samples.
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Old 28th November 2011, 08:41 PM   #862
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Tome the top octave looks noticeably smoother with the stock phase plug.

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Originally Posted by jzagaja View Post
... see below graph normalized to flat power. Better repeat on SEOS and baffle.
I find it hard to judge the directivity performance of anything other than a spectrogram normalized to flat on-axis response.

I'm not sure why, but I also find the stepped shaded graphs harder to digest than the previous smooth shaded ones.

Thanks for all your effort, jzagaja.
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Old 28th November 2011, 09:29 PM   #863
jzagaja is offline jzagaja  Poland
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ARTA directivity sonogram.
Attached Images
File Type: png DE250_FRESNEL_5.png (42.0 KB, 519 views)
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Old 29th November 2011, 06:02 AM   #864
_Wim_ is offline _Wim_  Belgium
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Quote:
Originally Posted by jzagaja View Post
ARTA directivity sonogram.
Could you post the raw impulse data also? Then we can generate any view we want for comparison... Many thanks
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Old 29th November 2011, 08:59 AM   #865
jzagaja is offline jzagaja  Poland
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Enclosed. For samples please contact Autotech: info at autotech.pl
Attached Files
File Type: zip FRESNEL.zip (39.5 KB, 34 views)
File Type: zip ORIGINAL.zip (39.3 KB, 14 views)
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Last edited by jzagaja; 29th November 2011 at 09:25 AM.
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Old 30th November 2011, 09:33 PM   #866
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Hello,
B&C phase plug look the same of that mounted on my Radian 475 PB as you can see in the picture.
Do you think that I can try your phase plug also on that driver without any problem?
Ciao
Guglielmo
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Old 30th November 2011, 09:55 PM   #867
jzagaja is offline jzagaja  Poland
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Internal dimensions are unknown. Remove and measure.
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File Type: gif FRESNEL_DE250.gif (13.5 KB, 474 views)
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Old 1st December 2011, 08:08 PM   #868
_Wim_ is offline _Wim_  Belgium
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Quote:
Originally Posted by jzagaja View Post
Enclosed. For samples please contact Autotech: info at autotech.pl
Hello jzagaja,
I get some strange results looking at the raw data. I had to convert your files to pcm-format with Audacity before Arta could read them. But there seems to be something strange with level, as the higher of axis measurement are louder than the on-axis measurements. Did you make the measurements with Arta, of did you use some other software?
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Old 1st December 2011, 08:27 PM   #869
jzagaja is offline jzagaja  Poland
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ARTA files enclosed.
Attached Files
File Type: zip DE250_ORIGINAL_ARTA.zip (39.4 KB, 14 views)
File Type: zip DE250_FRESNEL_ARTA.zip (39.6 KB, 12 views)
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Old 2nd December 2011, 05:28 AM   #870
hum4god is offline hum4god  United States
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Default iwata and B7C DCM50 ?

Hi jzagaja

did you ever get a chance to listen and measure the B&C DCM50 with one of your horns?
i would be especially interested how it sounds and measures w/ the Iwata 300 ?

thanks
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