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4th order bandpass box. Yes or no?
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<blockquote data-quote="Buck" data-source="post: 8832276" data-attributes="member: 591582"><p>A 4th order bandpass is mainly a sealed box. The sealed chamber will have a certain peak resonance based on the sub’s parameters and the size of the box. The ported section is almost always used to boost the peak Fc of sealed or to boost higher frequencies. The sealed side is your low tuned side in a 4th BP. The front ported chamber on a 4th works way differently than a regular ported box would. For example, with the sealed being the low tuned side, I’ve done a 4th tuned to 43 hz and the whole bass system peaked at 28-29 hz due to the low frequency of the rear chamber. The front chamber on a 4th is simply a booster chamber for the rear, and it’s usually tuned at Fc of sealed or higher, because putting any enclosure as a rear and having a front chamber with port will make the rear chamber tuned lower, due to the rear sound having to pass through a longer pathway to exit the box vs a regular sealed box or regular ported (vs a series 6th BP). Many people for daily with 4th’s tune the front to 45-50 hz. The main thing is to make sure your subs play low enough in sealed not to get choked out on the lows, because that can happen regardless of where the front chamber tuning is at.</p></blockquote><p></p>
[QUOTE="Buck, post: 8832276, member: 591582"] A 4th order bandpass is mainly a sealed box. The sealed chamber will have a certain peak resonance based on the sub’s parameters and the size of the box. The ported section is almost always used to boost the peak Fc of sealed or to boost higher frequencies. The sealed side is your low tuned side in a 4th BP. The front ported chamber on a 4th works way differently than a regular ported box would. For example, with the sealed being the low tuned side, I’ve done a 4th tuned to 43 hz and the whole bass system peaked at 28-29 hz due to the low frequency of the rear chamber. The front chamber on a 4th is simply a booster chamber for the rear, and it’s usually tuned at Fc of sealed or higher, because putting any enclosure as a rear and having a front chamber with port will make the rear chamber tuned lower, due to the rear sound having to pass through a longer pathway to exit the box vs a regular sealed box or regular ported (vs a series 6th BP). Many people for daily with 4th’s tune the front to 45-50 hz. The main thing is to make sure your subs play low enough in sealed not to get choked out on the lows, because that can happen regardless of where the front chamber tuning is at. [/QUOTE]
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4th order bandpass box. Yes or no?
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