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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: RE: Observable Woofer Cone Movement posted by House13 on April 21, 2015 at 07:26:12:
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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- Gallo Ref 3.5 - Bry 07:54:21 04/21/15 (0)
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