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Old 2nd February 2005, 04:36 AM   #11
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It occurs to me that one of the things that can be done to reduce the problem, at least in one respect, is to locate the mid-range and tweeter in low frequency axial standing wave nodes. I've never heard anyone talk about this thought before.
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Old 2nd February 2005, 05:40 AM   #12
Stocker is offline Stocker  United States
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Perhaps, but wouldn't there be various locations for the nodes depending on frequency?
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Old 2nd February 2005, 06:17 AM   #13
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A little off-topic tough (since it is not dealing with ESL) but the mechanical stress on drivers by acoustical coupling is even relevant in the ara of tough professional equipment:

"For example, the horns attached to the driver act in both directions - not only do they transform and radiate sound from the driver to the outside world, but they also focus external sounds on to the diaphragm, adding significantly to its stresses."

Taken from:

http://www.meyersound.com/support/fo...op/drivers.htm

Regards

Charles
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Old 3rd February 2005, 11:30 AM   #14
Pan is offline Pan  Sweden
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If a closed box sub is used with dipole you simply place the sub at 90 degrees to dipole and voila, no problem from the direct outputoif the sub.

And with multiway dipole you need a gap between each range just like ML did it with their big speaker system.

The problem also exist with coned drivers as someone was concerned with, but the cone mass and enclosed volume beind makes this much less of a problem compared to a dipole ELS membrane.

By the laws of nature the mids and tweeters thast are most sensitive to this is of course those with soft suspension, low mass and big volume of air in the box behind. The stiffer the suspension, higher the mass and smaller the volume of air in the box the less this moving system will move according to a outside pressure acting on it.

Moving coil dipole speakers are more sensitive than closed box but less so than ESL.

In the end it is actually dipoles (no matter if moving coil, ESL or magnetostats) that can be arranged to be least affected by this phenomena, simply by doing it like ML. With perfect symmetrical dipoles and air gaps between panels there will be no force acting between the panels.

/Peter
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Old 3rd February 2005, 04:11 PM   #15
Pan is offline Pan  Sweden
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Quote:
Originally posted by Stocker
Perhaps, but wouldn't there be various locations for the nodes depending on frequency?
Yes!

And while a boxed mid/tweeter would function best at a certain frequency node where the pressure is max and speed of air is minimum, the other way is true for a dipole velocity source.

Think about how dipoles vs. monopoles excite room modes... they do not do that in the same way and at same locations... food for thought.

/Peter
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