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<blockquote data-quote="Jeffdachef" data-source="post: 8587294" data-attributes="member: 650438">Can you do an octoport? a single 5.5 diameter port would be under the threshold of port noise.&nbsp; If possible have the port fire to the rear or side... If you are firing up, make sure its long enough so the port is very close to the roof if you want lows and proper loading.To explain your results, this is why we design boxes around the power you will use.&nbsp;&nbsp; Those XFLs with low power will require much less port area to get loud because they arent building enough pressure.&nbsp;&nbsp; However when you put more power onto them, the port you need to use will need to be much bigger to accomadate or else you run into both noise AND compression AKA you wont get any louder when you throw more power onto them.With it stands now, if you want to get loud with those 4 inch ports, you&#039;ll need to throw 1500 rated watts per woofer or about 800 clamped in order to get louder output.&nbsp; OR you make the box bigger if you want lows. More power you have, the more air will be displaced which means you need a bigger hole to breath.&nbsp; However if you dont have much power and too big of a hole, you arent building up any pressure.This is why you usually dont follow the port per cube rule to the teeth, thats just a general guideline for noobs. The actual numbers can vary greatly depending on driver parameters, power and other factors.</blockquote>

[QUOTE="Jeffdachef, post: 8587294, member: 650438"] Can you do an octoport? a single 5.5 diameter port would be under the threshold of port noise. If possible have the port fire to the rear or side... If you are firing up, make sure its long enough so the port is very close to the roof if you want lows and proper loading. To explain your results, this is why we design boxes around the power you will use. Those XFLs with low power will require much less port area to get loud because they arent building enough pressure. However when you put more power onto them, the port you need to use will need to be much bigger to accomadate or else you run into both noise AND compression AKA you wont get any louder when you throw more power onto them. With it stands now, if you want to get loud with those 4 inch ports, you'll need to throw 1500 rated watts per woofer or about 800 clamped in order to get louder output. OR you make the box bigger if you want lows. More power you have, the more air will be displaced which means you need a bigger hole to breath. However if you dont have much power and too big of a hole, you arent building up any pressure. This is why you usually dont follow the port per cube rule to the teeth, thats just a general guideline for noobs. The actual numbers can vary greatly depending on driver parameters, power and other factors. [/QUOTE]

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