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General Car Audio
excursion above Fb
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<blockquote data-quote="bbeljefe" data-source="post: 8199956" data-attributes="member: 655960"><p>What do you mean when you say output decreases above Fb? More often than not, output is flat above Fb.</p><p></p><p>So let's clarify things before we start debating with different definitions.</p><p></p><p>If the reference is flat, then output above flat is an increase and output below flat is a decrease.</p><p></p><p>In most ported enclosures output at and just around Fb is increased and the further above Fb you go, the closer it gets back to flat until it is again flat. Consequently, output below Fb tends to fall off more quickly and always decreases dramatically below flat.</p><p></p><p>With that said, output always falls above Fb in a vented enclosure (flat responding designs notwithstanding). If it decreases above Fb (below flat) then the box is poorly designed.</p><p></p><p>Also, how do you define "recommend"? I ask because that is an entirely subjective term. Recommended by whom and for what purpose? Manufacturers usually recommend a box that blends multiple concerns... mostly the safety (power handling) of the sub, overall sound quality (or pressure) in a variety of environments and of course, space constraints... in that order of importance. Myself, on the other hand, might tend to recommend a box that takes the most advantage of sound quality to one person but to another, I might recommend a box that takes the most advantage of sound pressure. Still to other customers, I might recommend a box that takes the most advantage of power handling... all depending on the user's, level of competence/knowledge, their goals and the amount of space they have to work with... and again, in that order of importance.</p><p></p><p>Regarding excursion, more volume equates to more excursion and less volume to less. Small volumes can restrain excursion that could be beneficial (think sealed box) and large volumes can rob the sub of much needed acoustical excursion control (think cheap subs). All of this happens to one degree or another at all frequencies above, at and below Fb and all of it is dependent on the sub, the alignment, the volume and the amount of power per application.</p></blockquote><p></p>
[QUOTE="bbeljefe, post: 8199956, member: 655960"] What do you mean when you say output decreases above Fb? More often than not, output is flat above Fb. So let's clarify things before we start debating with different definitions. If the reference is flat, then output above flat is an increase and output below flat is a decrease. In most ported enclosures output at and just around Fb is increased and the further above Fb you go, the closer it gets back to flat until it is again flat. Consequently, output below Fb tends to fall off more quickly and always decreases dramatically below flat. With that said, output always falls above Fb in a vented enclosure (flat responding designs notwithstanding). If it decreases above Fb (below flat) then the box is poorly designed. Also, how do you define "recommend"? I ask because that is an entirely subjective term. Recommended by whom and for what purpose? Manufacturers usually recommend a box that blends multiple concerns... mostly the safety (power handling) of the sub, overall sound quality (or pressure) in a variety of environments and of course, space constraints... in that order of importance. Myself, on the other hand, might tend to recommend a box that takes the most advantage of sound quality to one person but to another, I might recommend a box that takes the most advantage of sound pressure. Still to other customers, I might recommend a box that takes the most advantage of power handling... all depending on the user's, level of competence/knowledge, their goals and the amount of space they have to work with... and again, in that order of importance. Regarding excursion, more volume equates to more excursion and less volume to less. Small volumes can restrain excursion that could be beneficial (think sealed box) and large volumes can rob the sub of much needed acoustical excursion control (think cheap subs). All of this happens to one degree or another at all frequencies above, at and below Fb and all of it is dependent on the sub, the alignment, the volume and the amount of power per application. [/QUOTE]
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