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<blockquote data-quote="bbeljefe" data-source="post: 8291136" data-attributes="member: 655960">The box doesn&#039;t have to be tuned to the Fs of the sub. You can tune however you like depending on what your goals are and where the sub will live. And yes, more vent area means a longer vent is needed for the same frequency. Also, subs will usually unload (over excursion) at some point below tuning because the box will no longer have any control over cone movement. Making the vent smaller can help this but as with anything, there will be other negatives created such as chuffing or, vent noise.In the end, I do not recommend WinISD Pro for novice users. It&#039;s a reasonably complicated and buggy program and if your TS parameters aren&#039;t dead on the money (which most manufacturer&#039;s published TS numbers are not) it will not present you with a very accurate picture of the driver&#039;s performance. That said, you can find a copy of WinISD Beta online but not at Linear Team&#039;s website. It&#039;s a much easier and more forgiving program for novice users and it&#039;s even good for pros. I used it for years and still sometimes do when I&#039;m not interested in complicated data entry for a simple box.</blockquote>

[QUOTE="bbeljefe, post: 8291136, member: 655960"] The box doesn't have to be tuned to the Fs of the sub. You can tune however you like depending on what your goals are and where the sub will live. And yes, more vent area means a longer vent is needed for the same frequency. Also, subs will usually unload (over excursion) at some point below tuning because the box will no longer have any control over cone movement. Making the vent smaller can help this but as with anything, there will be other negatives created such as chuffing or, vent noise. In the end, I do not recommend WinISD Pro for novice users. It's a reasonably complicated and buggy program and if your TS parameters aren't dead on the money (which most manufacturer's published TS numbers are not) it will not present you with a very accurate picture of the driver's performance. That said, you can find a copy of WinISD Beta online but not at Linear Team's website. It's a much easier and more forgiving program for novice users and it's even good for pros. I used it for years and still sometimes do when I'm not interested in complicated data entry for a simple box. [/QUOTE]

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