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<blockquote data-quote="LoneRanger" data-source="post: 532054" data-attributes="member: 540903">You can&#039;t just assume how much it will need. I said &quot;assume&quot; because i was creating a hypothetical situation. The area of the port in relation to the driver&#039;s sd is just as realevent to output (read as SPL) as the tuning frequency. More port area = more output.The more surface area the port has, the longer it will have to be to achieve a given tuning frequency as compared to a port with less surface area.It&#039;s pretty much a given that a box with a larger port will allow the woofer to reach XMAX with less effort because there&#039;s not as much resistance. If you&#039;re designing an SPL system and your only goal is efficiency and output, go for a big port. If you&#039;re trying to maintain tonal accuracy, go smaller. Just remember, this port has to actually fit inside your box so if you&#039;re trying to tune the port to 25hz and you want 80 square inches of port, the port is probably going to be bigger than the woofer chamber.</blockquote>

[QUOTE="LoneRanger, post: 532054, member: 540903"] You can't just assume how much it will need. I said "assume" because i was creating a hypothetical situation. The area of the port in relation to the driver's sd is just as realevent to output (read as SPL) as the tuning frequency. More port area = more output. The more surface area the port has, the longer it will have to be to achieve a given tuning frequency as compared to a port with less surface area. It's pretty much a given that a box with a larger port will allow the woofer to reach XMAX with less effort because there's not as much resistance. If you're designing an SPL system and your only goal is efficiency and output, go for a big port. If you're trying to maintain tonal accuracy, go smaller. Just remember, this port has to actually fit inside your box so if you're trying to tune the port to 25hz and you want 80 square inches of port, the port is probably going to be bigger than the woofer chamber. [/QUOTE]

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