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<blockquote data-quote="PowerNaudio" data-source="post: 1182939" data-attributes="member: 561215">that&#039;s true,if you build the box taking into account the T/S parameters of the sub. then you would not put a sub that has a high Qts,&nbsp; and soft suspension, low EBP in a ported box, ones you get out of the &quot;safe zone&quot; of the tuning freq the sub might bottom out, so using a sub with low QTS, low Fs, high EBP would most likely not have the problem of bottoming out when playing out side the tuning freq of the sub.EBP:taking the driver free air resonance (Fs) and dividing it by the electrical Q (Qes). If the resulting number is around 50 or less, you are looking at a driver that is best suited to a sealed type box. If the EBP is between 50 and around 100 or more, the speaker will work best in a vented enclosure. Horn loaded designs will perform best with an EBP of 150 or even higher.Sealed box (and sealed bandpass) woofers should have the following characteristics:Qts =&amp;gt; 0.40FsXmax =&amp;gt; 4 mmVented or ported box (and ported bandpass) woofers should have the following characteristics:QtsFsVas should be relatively low (less than 4 cubic feet unless enclosure size is not a factor).pretty much enclosure design is critical not only to make the subwoofer sound good, but to keep other parameters like over excursion under control.</blockquote>

[QUOTE="PowerNaudio, post: 1182939, member: 561215"] that's true, if you build the box taking into account the T/S parameters of the sub. then you would not put a sub that has a high Qts, and soft suspension, low EBP in a ported box, ones you get out of the "safe zone" of the tuning freq the sub might bottom out, so using a sub with low QTS, low Fs, high EBP would most likely not have the problem of bottoming out when playing out side the tuning freq of the sub. EBP: taking the driver free air resonance (Fs) and dividing it by the electrical Q (Qes). If the resulting number is around 50 or less, you are looking at a driver that is best suited to a sealed type box. If the EBP is between 50 and around 100 or more, the speaker will work best in a vented enclosure. Horn loaded designs will perform best with an EBP of 150 or even higher. Sealed box (and sealed bandpass) woofers should have the following characteristics: Qts => 0.40 Fs Xmax => 4 mm Vented or ported box (and ported bandpass) woofers should have the following characteristics: Qts Fs Vas should be relatively low (less than 4 cubic feet unless enclosure size is not a factor). pretty much enclosure design is critical not only to make the subwoofer sound good, but to keep other parameters like over excursion under control. [/QUOTE]

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