Is xmax directly related to port area?

try like 80-100 of port and see what sounds like...and no, its not that easy to just change the port on an already constructed box
//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif Time to sell it to a hood rat for 100

 
Yes a longer port yields lower tuning resulting in flatter response, but the ultimate unanswered question is when you have a sub, and know the paramaters, what the FU*ck do you do for port area?

 
No, Xmax is not directly related to port area. It is a bit more complicated than that.

As far as rules are concerned, the 12-16 square inches of port for every cubic foot of volume works well for most. Obviously things change a bit with your application but this is maybe the best general rule.

A longer port may mean a lower Fb but it doesn't mean flatter response.

 
devildriver thanks for your help it seems like your one that at least has an idea whats going on. how can you say that 12 to 16, which is a big variance, can still be the rule, thats no rule. What determines wether we choose 12 14 or 16? I know given the same sub cu ft and tuning changing from 12 to 16 will have a dramatic effect on the output but how can we be guided before we design the box?

 
No, Xmax is not directly related to port area. It is a bit more complicated than that.
As far as rules are concerned, the 12-16 square inches of port for every cubic foot of volume works well for most. Obviously things change a bit with your application but this is maybe the best general rule.

A longer port may mean a lower Fb but it doesn't mean flatter response.
Sorry im still noobish for making boxes. Whats fb? frequency?

 
devildriver thanks for your help it seems like your one that at least has an idea whats going on. how can you say that 12 to 16, which is a big variance, can still be the rule, thats no rule. What determines wether we choose 12 14 or 16? I know given the same sub cu ft and tuning changing from 12 to 16 will have a dramatic effect on the output but how can we be guided before we design the box?
From 12-16 square inches is not a big difference unless you're using a high displacement driver with an enclosure that results in a port velocity that would be higher than normal...thus requiring the use of more port area.

Sorry im still noobish for making boxes. Whats fb? frequency?
Fb is what many call a "tuning" frequency.

 
So say if your going for SPL or sound quality would anyone safely say that more PA is going to yeild more spl but less clarity? Also would more port area increase the boominess of a ported box?

 
From 12-16 square inches is not a big difference unless you're using a high displacement driver with an enclosure that results in a port velocity that would be higher than normal...thus requiring the use of more port area.


Fb is what many call a "tuning" frequency.
Ok but I dont see how people have port lengths that are about 5 ft when someone can have the same tuning at a shorter length. I read that it is for a flatter responce but like I said Im still a noob at boxes and want to learn.

 
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