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How does a 4th order bandpass work?
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<blockquote data-quote="Buck" data-source="post: 8794205" data-attributes="member: 591582"><p>A 4th order BP is literally just a sealed box that has a front or outer “booster” ported chamber. A 4th BP is simply just a sealed box with a booster ported chamber on the front to help extra pressurize a certain bandwidth that the sealed reproduces. A 4th BP is literally just a sealed box dropped inside of a ported box, where you tune the ported box to boost a certain bandwidth of the sealed with a certain peak of frequency with the tuning. In a big wall or something, you can have a Fsc of say 45 hz and tune your front port to 45 hz and that’ll be a banger, where in home audio you can have a Fsc of like 30-35 hz with a huge sealed portion and a tiny ported portion tuned up into the 60 hz range. You can do it however fancies you. You can even put a sealed box inside of a horn or t-line, and it still functions like a 4th order BP, just with different roll offs/ dB octaves per slope of fade from the peak. I’ve done sealed-t-line hybrids before and they work well for SQ.</p><p></p><p>Any sealed box has you relying heavily on a proper woofer with proper Fs and Vas and Q values to meet your required listening for your bass.</p><p></p><p>I rarely see people talk about Qtc and Fsc when talking about 4th order BP’s, which is honestly the most important two stats.</p><p></p><p>Any bandpass enclosure like we do in car audio audio has a primary chamber that the rest of the chambers are based on, and the sealed chamber is the primary chamber for 4th BP’s. You must absolutely have a perfect spec sealed chamber before you even make another step in designing the ported section. Ported sections on 4th BP’s are just boosters. Like a v8 drag racing motor is the sealed section and the ported section is just the nitrous you use to go faster, but the ported nitrous can’t be used at all without the motor. My point being a 4th order BP is an advanced sealed enclosure, fundamentally, and maybe people don’t understand what that really means or the dynamic that gives the enclosure.</p><p></p><p>Sealed has its limitations that it carries into 4th order BP’s, so you have to master sealed boxes to even begin to master 4th BP’s.</p></blockquote><p></p>
[QUOTE="Buck, post: 8794205, member: 591582"] A 4th order BP is literally just a sealed box that has a front or outer “booster” ported chamber. A 4th BP is simply just a sealed box with a booster ported chamber on the front to help extra pressurize a certain bandwidth that the sealed reproduces. A 4th BP is literally just a sealed box dropped inside of a ported box, where you tune the ported box to boost a certain bandwidth of the sealed with a certain peak of frequency with the tuning. In a big wall or something, you can have a Fsc of say 45 hz and tune your front port to 45 hz and that’ll be a banger, where in home audio you can have a Fsc of like 30-35 hz with a huge sealed portion and a tiny ported portion tuned up into the 60 hz range. You can do it however fancies you. You can even put a sealed box inside of a horn or t-line, and it still functions like a 4th order BP, just with different roll offs/ dB octaves per slope of fade from the peak. I’ve done sealed-t-line hybrids before and they work well for SQ. Any sealed box has you relying heavily on a proper woofer with proper Fs and Vas and Q values to meet your required listening for your bass. I rarely see people talk about Qtc and Fsc when talking about 4th order BP’s, which is honestly the most important two stats. Any bandpass enclosure like we do in car audio audio has a primary chamber that the rest of the chambers are based on, and the sealed chamber is the primary chamber for 4th BP’s. You must absolutely have a perfect spec sealed chamber before you even make another step in designing the ported section. Ported sections on 4th BP’s are just boosters. Like a v8 drag racing motor is the sealed section and the ported section is just the nitrous you use to go faster, but the ported nitrous can’t be used at all without the motor. My point being a 4th order BP is an advanced sealed enclosure, fundamentally, and maybe people don’t understand what that really means or the dynamic that gives the enclosure. Sealed has its limitations that it carries into 4th order BP’s, so you have to master sealed boxes to even begin to master 4th BP’s. [/QUOTE]
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How does a 4th order bandpass work?
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