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Old 21st September 2011, 09:34 PM   #11
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Dipole= The sound radiating from the front is out of phase with the sound radiating to the rear.

Examples would be Apogee, Magnepan, Acoustat, any ribbon, electrostatic or NXT speakers that the rear wave is open and free to radiate into the room. Even a cone woofer is dipole when the back wave is allowed to radiate freely. Examples would be the Carver Amazing, Gilmore, or most of the open baffle speakers popular on this site. You can even mount two box speakers back to back and wire them out of phase and that would be dipole radiation.

Bipole= The sound radiating from the front is in phase with the sound radiating to the rear.

Most of the examples I can think of are used for rear surround speakers in home theater set ups where there are woofers and tweeters facing forward and to the rear wired in phase. Also when you see box speakers with an extra tweeter on the back it us usually wired in phase to make it bipole in the treble. If you take two box speakers and mount them back to back and wire them in phase that is bipole radiation.

The Heil driver is very unique in that it is not the front to back movement of a diaphragm that makes the sound like in almost all other speakers. Instead it is a folded accordion diaphragm that compresses from side to side squeezing the air from in between the pleats to the front and rear in phase that makes the sound. Very unique driver.

Sorry for the lengthy explanation, you probably knew most of this info, but you asked
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Old 6th January 2012, 04:15 PM   #12
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The accordion picture may lead to misunderstanding of the principle.
We had that discussion in a Norwegian forum lately if this driver is a bipole, dipole or a bi/dipole. To make this short, The Stig measured the pulse response in front and from the rear of the unit. It proved to be a dipole.
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Old 6th January 2012, 04:52 PM   #13
hum4god is offline hum4god  United States
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because this thread came back up from the archives i wanted ti update it as sold
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