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Enclosure Design & Construction
How to/what to consider when designing 4th order bandpass
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<blockquote data-quote="Buck" data-source="post: 8766062" data-attributes="member: 591582"><p>Sealed peak resonance is Fc or Fsc or in a 4th order bandpass could be called Frc. I always check what a woofer's Fsc and Qtc are in sealed to determine how they will play in a 4th order bandpass. </p><p></p><p>Over say 1000-1500w, I also recommend inverse mounting the woofers (motor in ported chamber) to help motor and coil cooling.</p><p></p><p>Also, depending on the the quality of the woofer or strength, you may want to do individual sealed chambers for each sub. Some of the higher quality, well made subs can all share one large sealed chamber with each other. Some lower powered/softer subs or cheaper-made subs can have issues being damaged by having a bunch of subs all compressing air in the same chamber. Cones and surrounds can blow out or break, in some situations. One large sealed chamber will resonate lower than the same amount of airspace divided up into multiple chambers, so keep that in mind.</p><p></p><p>Ported to sealed ratio is a farce; that's a doodoo way to determine a 4th order bandpass. Both sealed and ported airspaces should be considered based off how much air the subs can properly pressurize, not a ratio. </p><p></p><p>You can tune the ported side to the sealed resonance, or you can tune differently. It just depends on what the sealed resonance is and what your overall goals are for the system.</p><p></p><p>Most of the higher powered subs will do better in ported boxes or series 6th orders, but there are some higher powered subs (say 3000w+) that will work being played in a sealed chamber.</p><p></p><p>Don't do too much port area on your 4th order. Often times, they don't need as much as people think they do, from what I've seen. It depends; a b-pillar 4th order wall's port area is going to work somewhat differently than a smaller 4th order bandpass. If you want a musical response, go with a proper amount of port area. It's the same idea with any ported chamber: your port area can determine overall bandwidth and peakiness, so it's important to know what kind of port area you need. A 500w sub in a 4th order is going to probably need less port area than a 3500w sub.</p></blockquote><p></p>
[QUOTE="Buck, post: 8766062, member: 591582"] Sealed peak resonance is Fc or Fsc or in a 4th order bandpass could be called Frc. I always check what a woofer's Fsc and Qtc are in sealed to determine how they will play in a 4th order bandpass. Over say 1000-1500w, I also recommend inverse mounting the woofers (motor in ported chamber) to help motor and coil cooling. Also, depending on the the quality of the woofer or strength, you may want to do individual sealed chambers for each sub. Some of the higher quality, well made subs can all share one large sealed chamber with each other. Some lower powered/softer subs or cheaper-made subs can have issues being damaged by having a bunch of subs all compressing air in the same chamber. Cones and surrounds can blow out or break, in some situations. One large sealed chamber will resonate lower than the same amount of airspace divided up into multiple chambers, so keep that in mind. Ported to sealed ratio is a farce; that's a doodoo way to determine a 4th order bandpass. Both sealed and ported airspaces should be considered based off how much air the subs can properly pressurize, not a ratio. You can tune the ported side to the sealed resonance, or you can tune differently. It just depends on what the sealed resonance is and what your overall goals are for the system. Most of the higher powered subs will do better in ported boxes or series 6th orders, but there are some higher powered subs (say 3000w+) that will work being played in a sealed chamber. Don't do too much port area on your 4th order. Often times, they don't need as much as people think they do, from what I've seen. It depends; a b-pillar 4th order wall's port area is going to work somewhat differently than a smaller 4th order bandpass. If you want a musical response, go with a proper amount of port area. It's the same idea with any ported chamber: your port area can determine overall bandwidth and peakiness, so it's important to know what kind of port area you need. A 500w sub in a 4th order is going to probably need less port area than a 3500w sub. [/QUOTE]
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How to/what to consider when designing 4th order bandpass
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