Sorry, a language problem here - vacuum is the wrong word, I just mean that
there is no resonance volume behind the membrane, or a tuned resonance volume.
Klas.
ehAt 23:48 2002-02-08 -0500, you wrote:
>Klas Strandberg wrote:
>>
>> The membrane of a omni faces "nothing", except "vacuum". There is no air
>> behind it. The back is closed, or has a "can" behind which size is tuned so
>> that it "helps" the membrane moving, still maintaining a "flat" frequency
>> curve.
>
>The Omni's I've examined were sealed, but did not have a vacuum. They
>all seemed to be at normal pressure behind. In fact, some were vented,
>though not presumably enough to let sound vibration in.
>
>How widespread is using a true vacuum behind?
>
>Walt
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