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Old 12th February 2011, 03:10 PM   #1
kach22i is offline kach22i  United States
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Default Visual on Frequency Generation off Cone, Dust Cap and or Whizzer

Request: Man Seeking Visual/Graphic on FR Frequency Generation off Cone, Dust Cap and or Whizzer.

This can be free-air/open baffle or mounted in a box, sealed or ported...........I cannot find a thing on my own. I'm hoping there is a GIF or video with a strobe light (or smoke) which illustrates this. Perhaps maybe even a computer generated animation used in educational circles is floating around the Internet.

1. It is my understanding that the high frequencies off a conventional dynamic driver emanate from the center, off the voice coil and transfer outward through the cone to the rim/edge. The edge where the rubber/foam surround is generates the deepest bass, the middle frequencies come off the middle of the cone (right?).

2. However on whizzers with the free edge sticking up in the air with no surround, it is the rim top edge where most of the high frequencies emanate from (right?).

Please feel free to correct any of my statements, they are not stated as facts, only as my current understanding.

A picture or video would go a long way towards helping me understand this topic.
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Old 12th February 2011, 06:19 PM   #2
kach22i is offline kach22i  United States
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I still have not found anything on the actual cone. However what is shown below is close. I'm still looking for something which applies to Full-Range drivers and any "skin effect" of frequency change on the cone/cap and distance from center to edge.

Just having the correct terms will allow me to do a better search. What is the term or phrase I should be working with?

September 2009 - Posts - Tech Blog
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Edit: getting closer..................?

Choosing an Ultrasonic Sensor for Proximity or Distance Measurement Part 2: Optimizing Sensor Selection | Sensors
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Simeon: Omnipanel speakers
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Green Mountain Audio - Time-and-Phase-Coherence
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File Type: jpg Cone breakup.jpg (20.5 KB, 19 views)
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Old 12th February 2011, 06:41 PM   #3
kach22i is offline kach22i  United States
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I'm looking for something like this, but as an actual slow motion video or something (in 3D if possible), and for conventional cone speakers.

Speakers - Bending Wawe Transducers
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Old 13th February 2011, 01:16 PM   #4
hm is offline hm  Europe
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Kach 221,
only a few frequencies from a cone speaker is made by a "Kolben" movement, the T+S area and above, than it comes a "Schubbereich" working, than bendigwave area,
than a multiple faced array, the highest tones are made only by the voice coil.
Your last pic shows the Manger driver, AFAIK on the manger HP there are
shown laser holographic pictures where you can see the "movement" of the Manger.
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Old 13th February 2011, 05:08 PM   #5
kach22i is offline kach22i  United States
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Thank you for the additional search terms hm.

I'll post what I find later on, a few other things are on my plate right now.

Manger - Precision in Sound
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Quote:
The images made with laser Doppler vibrometrics show the concentric wave movement of the bending wave diaphragm at various frequencies.

Manger
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Is "kolben" German for piston?
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Last edited by kach22i; 13th February 2011 at 05:12 PM.
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Old 13th February 2011, 06:32 PM   #6
hm is offline hm  Europe
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yes i think piston is kolben,
BTW my Manger solution from 1992 tested in Klang +Ton here:
basstuba
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