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Old 23rd May 2017, 09:40 PM   #11
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by WrineX View Post
bad dispersion if kind of normal for such larg panels not that bad. its more the high end thats pretty limited in my opinion
Yes, the shape of the panel will dictate it's beamwidth. A flat panel will have a beamwidth of zero degrees. If you curve the panel you'll get a wider beamwidth, that's why Martin Logans are curved. The beamwidth is maintained down to the physical size of the panel. IE, a panel that's seven inches wide will maintain directivity control down to 2000Hz. The upper limit on the panel is largely dependent on mass, that's why ribbon tweeters can play to 40khz while dome tweeters crap out around 20khz.
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Old 23rd May 2017, 10:08 PM   #12
bolserst is offline bolserst  United States
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Originally Posted by Patrick Bateman View Post
One meter
Thanks.
I'm still a bit puzzled by the CSD... looks quite different from the BG Neo8, which decays quite rapidly.
Still, if you look at the time scale and compare to a cone midrange driver, I guess it is still reasonable.

I am surprised to see no hint of a cavity resonance which is pretty much a "feature" of all push-pull magenetic planars. Is the 5dB EQ you mention hiding it perhaps?
Id be interested to see a near field and/or 1m measurement without the EQ in place if you have the time and interest.

BTW, I had not realized that Bruce Thigpen was involved in the Monsoon planar design.
That goes a long way to explaining the impressive distortion performance.
Too bad there were so many issues with neo magnet corrosion.
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File Type: pdf Thigpen_US6104825.pdf (787.2 KB, 10 views)
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Old 23rd May 2017, 10:23 PM   #13
Patrick Bateman is offline Patrick Bateman  United States
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Yep! A legitimately HiFi ribbon which wound up in a computer speaker. I got mine by buying the computer speakers on eBay and just ditching everything but the drivers.

Eminent Technology: home
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Old 24th May 2017, 01:23 AM   #14
Jim Griffin is offline Jim Griffin  United States
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Planar and ribbon drivers are known for their wide dispersion in the horizontal plane (transducer mounted vertically) but limited dispersion in the vertical plane. Longer drivers have more limited vertical plane dispersion versus frequency. Shorter drivers can offer more balanced vertical and horizontal coverage. Furthermore, all planars have vertical plane dispersion trends toward their aperture height as frequency increases.

For line array use (to optimize coverage for sitting to standing in-room listening) shorter planar drivers are often stacked vertically) to increase their vertical dispersion.

Last edited by Jim Griffin; 24th May 2017 at 01:28 AM. Reason: correction
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Old 24th May 2017, 04:06 PM   #15
audiomagnate is offline audiomagnate  United States
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Originally Posted by WrineX View Post
bad dispersion if kind of normal for such larg panels not that bad. its more the high end thats pretty limited in my opinion
That's why I cross my Monsoons over at 2K. VMPS made some foam and platic gizmos (Constant Directivity Wave Guides) which addressed this problem. I'm in the process of making up a batch ( 12) for my speakers.
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Old 24th May 2017, 10:36 PM   #16
WrineX is online now WrineX  Netherlands
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Originally Posted by audiomagnate View Post
That's why I cross my Monsoons over at 2K. VMPS made some foam and platic gizmos (Constant Directivity Wave Guides) which addressed this problem. I'm in the process of making up a batch ( 12) for my speakers.
wont the dispersion be bad where 2 panels meet ? where the panels are more open thus wider thus worse dispersion ?
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Old 24th May 2017, 10:50 PM   #17
Patrick Bateman is offline Patrick Bateman  United States
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That's why I cross my Monsoons over at 2K. VMPS made some foam and platic gizmos (Constant Directivity Wave Guides) which addressed this problem. I'm in the process of making up a batch ( 12) for my speakers.
You might like what I did here: Phase Plug for Planars
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Old 25th May 2017, 10:51 AM   #18
WrineX is online now WrineX  Netherlands
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You might like what I did here: Phase Plug for Planars
indeed interesting !
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Old 25th May 2017, 11:38 AM   #19
lowmass is offline lowmass  United States
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https://www.madisoundspeakerstore.co...n-tweeter-amt/

is this whats going on with the Mundorf's ?? Faceplate opennings look somewhat non symetrical
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Old 27th May 2017, 04:52 PM   #20
WrineX is online now WrineX  Netherlands
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https://www.madisoundspeakerstore.co...n-tweeter-amt/

is this whats going on with the Mundorf's ?? Faceplate opennings look somewhat non symetrical
i think it is. but that amount they did is not going to make a huge difference i believe
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