| how do Heil drivers work [message #78070] |
Thu, 10 October 2013 02:07  |
steve f
Messages: 238
Registered: May 2009
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Master |
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Here is the question.. Are they dipoles or bipoles. I believe they are dipoles, but I haven't been able to find a polar response chart of an open back Heil driver. Please help solve a friendly argument. Thanks.
Steve
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| Re: how do Heil drivers work [message #78132 is a reply to message #78129] |
Thu, 17 October 2013 16:48  |
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Wayne Parham
Messages: 18782
Registered: January 2001
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Illuminati (33rd Degree) |
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I think I see what you mean. If it moves up and down as an accordian, one might theorize that it is creating positive pressure on both sides equally when compressed, and negative pressure when expanded.
There is still a very easy answer, and that is to measure the device. You can easily see its behavior in measurements. If the acoustic pressure on both sides are phased the same, it's a bipole. If it's opposite on each side, it's a dipole. Then I suppose there's also the possibility it's something else. Look at the polars, and see its radiation pattern. Dipoles, bipole and monopoles all create different polar patterns.
Where both sides are driven, the only real difference between bipole and dipole is phase. They're 180° apart. But you can have any oter kind of phase relationship too, and then it is something else. So do some measurements. They'll tell you what it is.
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). But the one's I've known of, compare to the ribbon tweeter principle now day's. But the Heil AMT's I've heard we're omni-directional's(360deg), and you could never blow them as long as they we're x-over at the recommend freq... This made room acoustics come into play as far the placement speaker's that are using the Heil AMT's. But it's been years since I've heard about them. 
