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<blockquote data-quote="SounDrive" data-source="post: 8217464" data-attributes="member: 653833">I&#039;m on my phone so I don&#039;t have the Fc formula in front of me.For ratios:1:1 to 2:1 (ported:sealed) ratio is generally more oriented to having a better bandwidth or being daily. 2:1 and up is more SPL oriented and 5:1 is about where returns start diminishing from what I understand.For port area:It depends on the vehicle and box, optimal port area is almost always between 1/3 and 1/2 of cone area. It&#039;s usually better to go with 1/3 if you&#039;re doing a &quot;one and done&quot; box. If you&#039;re going to adjust, it&#039;s easier to start at 1/2 and slowly cut down.For tuning:Tune at Fc for daily and &quot;most&quot; SPL purposes. Some people will play with the tuning for a flatter response or for more SPL at a certain frequency although it&#039;s again a lot of testing. Also, aeros are always better than slot ports if the design allows for it. 4th orders are tuned high so the port length isn&#039;t usually very long so they work great.</blockquote>

[QUOTE="SounDrive, post: 8217464, member: 653833"] I'm on my phone so I don't have the Fc formula in front of me. For ratios: 1:1 to 2:1 (ported:sealed) ratio is generally more oriented to having a better bandwidth or being daily. 2:1 and up is more SPL oriented and 5:1 is about where returns start diminishing from what I understand. For port area: It depends on the vehicle and box, optimal port area is almost always between 1/3 and 1/2 of cone area. It's usually better to go with 1/3 if you're doing a "one and done" box. If you're going to adjust, it's easier to start at 1/2 and slowly cut down. For tuning: Tune at Fc for daily and "most" SPL purposes. Some people will play with the tuning for a flatter response or for more SPL at a certain frequency although it's again a lot of testing. Also, aeros are always better than slot ports if the design allows for it. 4th orders are tuned high so the port length isn't usually very long so they work great. [/QUOTE]

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