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Enclosure Design & Construction
How to/what to consider when designing 4th order bandpass
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<blockquote data-quote="20 hz bass machine" data-source="post: 8765652" data-attributes="member: 678131"><p>First things first you need modeling software! Without it you will not be able to dial in the enclosure properly.</p><p></p><p>Secondly, you need to make sure that you're using a sub that is suited for sealed applications. You can determine this by calculating the EBP (FS/Qes). An EBP below 50 is ideal but technically anything between 50&100 will fit the bill.I personally never go with a 4th order if the EBP is above 75.</p><p></p><p>After you've chosen a sub, you have a lot of factors to consider. Everything you do will change the design of the box and need to be accounted for.</p><p></p><p>Now you need to determine how much space you have/how much you're willing to give up.</p><p></p><p>From there I input the driver into my modeling software (BB6 in my case) and start by modeling a sealed enclosure in order to determine what the Q factor of my sealed section will be. </p><p></p><p>At this point I decide on a sealed section volume. I usually shoot for a Q of .707 although depending on box size, space available, power being used, and desired ratio. That is liable I change.</p><p></p><p>Once you've decided on a sealed side volume, yo will move over to 4tg order design and input your decided sealed volume. </p><p></p><p>This should give you a sealed side resonance. That resonance is what you tune your vented chamber to.</p><p></p><p>From there it's simply a matter of modeling the vented chamber to your desired ratio making sure to size the port properly and accounting for all internal displacements. </p><p></p><p>You'll notice that ass you change the tuning, the port changes, which changes the net volume which changes the ratio slightly which changes even more variables. All of which need to be accounted for and addressed before coming to a finished product.</p><p></p><p>There's a lot more to it than just this but I figured it would help someone who's just trying to get their feet wet</p></blockquote><p></p>
[QUOTE="20 hz bass machine, post: 8765652, member: 678131"] First things first you need modeling software! Without it you will not be able to dial in the enclosure properly. Secondly, you need to make sure that you're using a sub that is suited for sealed applications. You can determine this by calculating the EBP (FS/Qes). An EBP below 50 is ideal but technically anything between 50&100 will fit the bill.I personally never go with a 4th order if the EBP is above 75. After you've chosen a sub, you have a lot of factors to consider. Everything you do will change the design of the box and need to be accounted for. Now you need to determine how much space you have/how much you're willing to give up. From there I input the driver into my modeling software (BB6 in my case) and start by modeling a sealed enclosure in order to determine what the Q factor of my sealed section will be. At this point I decide on a sealed section volume. I usually shoot for a Q of .707 although depending on box size, space available, power being used, and desired ratio. That is liable I change. Once you've decided on a sealed side volume, yo will move over to 4tg order design and input your decided sealed volume. This should give you a sealed side resonance. That resonance is what you tune your vented chamber to. From there it's simply a matter of modeling the vented chamber to your desired ratio making sure to size the port properly and accounting for all internal displacements. You'll notice that ass you change the tuning, the port changes, which changes the net volume which changes the ratio slightly which changes even more variables. All of which need to be accounted for and addressed before coming to a finished product. There's a lot more to it than just this but I figured it would help someone who's just trying to get their feet wet [/QUOTE]
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How to/what to consider when designing 4th order bandpass
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