port size? port length?

[TheAnswer808 10+ year member]

on audiobahn it says port size 4x7.75''. does that mean four pieces of 7.75'' wood inside to make the ports or is that the size of the port on the box, size of the slotted port?help!

http://audiobahninc.com/frame2004.html

i have the 2004 alum12q

Click to read more...

 

[Acidburn 5,000+ posts]

that means you have a port with dimensions of 4"x7.75"

 

[TheAnswer808 10+ year member]

wait i dont understand how can a round port be 7.75 inches long? it's not a sq slotted port? jmac u think u culd help me design i sent u and email

 

[BASS OUTLAW 10+ year member]

i dont want to take over the thread, i need a forumla that change round port into square port or rectangle. example: 4o"x 6o" (its written that way in the manual.)

 

[Acidburn 5,000+ posts]

just figure you the area of it like a 4x4 port has 16 sq inches of port and you just use A=pi * r^2 to figure out the radius of the circle

 

[BASS OUTLAW 10+ year member]

pi was = to 0.34 ??? cant remember

 

[Acidburn 5,000+ posts]

pi is 3.14...... or close enough to that

 

[sumone 10+ year member]

^, yea I usually use 12 sig figs for pi (...265359)