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Enclosure Design & Construction
Old fart getting frustrated trying to design an enclosure for my first system build in 10 years
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<blockquote data-quote="Buck" data-source="post: 8766694" data-attributes="member: 591582"><p>That is very true, especially when you're playing music. Port area is hugely important and can really vary system by system. Some subs do well with 8-10 in^2/cube, some subs do better with 16 or even more. Your port is a resistance factor to air flow. It's actually an impedance factor, but the resistance from the port on the air being pressurized in the enclosure is what gives the box it's tuning. Too small of port = too much resistance = limited cone movement. Too big of port = lack of resistance = box doesn't pressurize well too far away from tuning frequency. Fine adjustments of port area can can help your sub move and play in the specific way that you want it to, but keep in mind port velocities change with the frequency being played.</p><p></p><p>There's also a relationship between port area and frequency. Depends somewhat on the woofer's Fs, but generally you need slightly more port area as you tune higher. There's ways to couple box tuning with port area for a specific bandwidth and peak effect, and the combos for those two things are almost infinite. Understanding the box size, port area, and port tuning relationship can greatly affect bandwidth, the severity of high or low end roll off, and overall peak. Sometimes different vehicles and different port positions within the same vehicle can use different port areas for overall effectiveness, even for the same subwoofer setup. You just gotta know your environment and how you want it to sound.</p></blockquote><p></p>
[QUOTE="Buck, post: 8766694, member: 591582"] That is very true, especially when you're playing music. Port area is hugely important and can really vary system by system. Some subs do well with 8-10 in^2/cube, some subs do better with 16 or even more. Your port is a resistance factor to air flow. It's actually an impedance factor, but the resistance from the port on the air being pressurized in the enclosure is what gives the box it's tuning. Too small of port = too much resistance = limited cone movement. Too big of port = lack of resistance = box doesn't pressurize well too far away from tuning frequency. Fine adjustments of port area can can help your sub move and play in the specific way that you want it to, but keep in mind port velocities change with the frequency being played. There's also a relationship between port area and frequency. Depends somewhat on the woofer's Fs, but generally you need slightly more port area as you tune higher. There's ways to couple box tuning with port area for a specific bandwidth and peak effect, and the combos for those two things are almost infinite. Understanding the box size, port area, and port tuning relationship can greatly affect bandwidth, the severity of high or low end roll off, and overall peak. Sometimes different vehicles and different port positions within the same vehicle can use different port areas for overall effectiveness, even for the same subwoofer setup. You just gotta know your environment and how you want it to sound. [/QUOTE]
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Old fart getting frustrated trying to design an enclosure for my first system build in 10 years
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