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<blockquote data-quote="jlaine" data-source="post: 359446" data-attributes="member: 542392">Add this with:1. The port adds little to output at all, except at tuning.2. Ported enclosures are much more suspectible to output flaws due to driver shifts, as well as enclosure shifts themselves. Ports suffer compression (as they compress, the tuning of the enclosure climbs), introduce resonances that don&#039;t belong in the frequency response, and actually detract from output almost as much as they add. Ports restrict cone movement because of the acoustical load presented on the back of the cone, which does two things - reduces the output of the driver, and takes your idea of countering the suspension in a sealed enclosure and multiplies it, because excursion is more fiercely limited in a ported enclosure than it is in a sealed one. On average a 3dB gain can be had, but you introduce a new set of problems that a sealed enclosure will not experience.</blockquote>

[QUOTE="jlaine, post: 359446, member: 542392"] Add this with: 1. The port adds little to output at all, except at tuning. 2. Ported enclosures are much more suspectible to output flaws due to driver shifts, as well as enclosure shifts themselves. Ports suffer compression (as they compress, the tuning of the enclosure climbs), introduce resonances that don't belong in the frequency response, and actually detract from output almost as much as they add. Ports restrict cone movement because of the acoustical load presented on the back of the cone, which does two things - reduces the output of the driver, and takes your idea of countering the suspension in a sealed enclosure and multiplies it, because excursion is more fiercely limited in a ported enclosure than it is in a sealed one. On average a 3dB gain can be had, but you introduce a new set of problems that a sealed enclosure will not experience. [/QUOTE]

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