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In Reply to: RE: Observable Woofer Cone Movement posted by Dave_K on April 21, 2015 at 06:08:51
It is possible I never saw this effect because I did not observe a driver at 90 degrees. The Audio Physic Caldera I gave as an example had side firing woofers. However, my Gallo Ref 3.5's have side firing 10" woofers and I do not see any pronounced cone movement. I do have program material with a variety of low frequencies including classical, jazz, film soundtracks and some test discs.
I introduced this topic hoping to explore it due to my technical ignorance. I wish to thank everyone who contributed to this topic with their observations, insights, experience and technical knowledge. Your time and attention is very much appreciated.
Follow Ups:
Something you may want to read about is distortion levels and waterfall graphs of drivers. You would be surprised to what level you would have to push some drivers to start distorting.I have no idea about this particular cones. But you usually do see more "action" with a more rigid or light reflective type material.
But yes cones move. even your silk dome tweeters shimmy and shack.
Edits: 04/21/15
You will notice a difference between the excursion of a sealed and a ported woofer at very low frequencies. A port adds to the output of the woofer at it's tuning frequency, but below that it begins to subtract from the output and acts more like an open baffle (mixing the woofer's front and rear wave in the room = cancellation). The woofers will then be restricted only by the stiffness of their suspensions so they will move more than sealed woofers which must push against a limited volume of air.It's probably worth doing some reading on sealed vs ported enclosures if you want to better understand what you're seeing. But in a nutshell:
Sealed: Speaker LF output falls off gently starting at a higher frequency. LF excursion is limited by the spring created by the enclosure space.
Ported: With the assistance of the port output, the speaker LF output remains flat to a lower frequency than sealed. Below that, the speaker output drops off more quickly than sealed. LF excursion is only limited by the enclosure above the region of the port resonance.
Edits: 04/21/15 04/21/15 04/21/15
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