Good Design?

[dappa5 10+ year member]

your'e right i was just giving him port area not length guessed he could do that on his own

 

[kfx450r 10+ year member]

Do you put in volume of box after displacement of the driver AND the port tubes or just with the driver. Becuz if i put in say 9 cubes with the driver..the length of porting is diff than if I put in say 8.8 cubes becuz of port displacement.

 

[siucsaluki11 10+ year member]

the box is 9.15 cubes counting the subs displacement but not the port displacement. Fi says 3.5-4 for each ported so i shuld be good even after port displacement
Guess i need a little less port if its 12-16 cuz 170 would be 18. 18"x6" port that goes 8.39" into the box would be 151 sq inches i think? at 35 hz.

18*6=108. Area is 2 dimensions, volume is 3. Quit thinking and guessing your numbers and just select the calculator app on your comp and plug numers in. Its not that hard.

 

[mlstrass 5,000+ posts]

use NET volume to determine port length/tuning. So you need to subtract subs, port, and any bracing that will be inside the box to determine the net size...