Round ports take up less space than square ports?

 

Silver Member
Username: Jprix82

Post Number: 484
Registered: Jan-06
Lets just say i needed 50sq.in. of port area,would round ports take up less space(port displacment)than square(slot)ports?
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 2643
Registered: Mar-04
yes...they would take up less volume. (because the wall of the port is thinner)

to get ~50sq inches of port w/ round ports...you would need four 4" ports, two 6" ports, or one 8". (but, slot ports are cheaper...and you can make them in and L-shape too)
 

Silver Member
Username: Geekbike

Post Number: 429
Registered: Dec-04
A 50 sq.in port equals a 8" diamter round port. A more practical approach would be 4 4" round ports (same port area), due to the trouble of finding 8" pipe and even more so if you need an elbow.

Assuming port length of 20" with 1 corner each:
round ports: 4*(pi*(4in/2)^2)*21in = 1055 cu.in
square port (assume 12"x4"): 12in*4.75in*24in = 1368cu.in

Round ports would take up slightly less room, but adding 4 ports and keeping the 1 diamter away from any other surface (general rule) might be more difficult.

 

Silver Member
Username: Rzarector

Coquitlam, Bc Canada

Post Number: 991
Registered: Dec-04
yeah i think slot ports are alot more convenient to.. when u go with bigger subs/displace more air and u need bigger ports.. sometimes its hard to route a big 6" pvc port in a box and have the end kept 6" away from the box walls as well
 

Silver Member
Username: Jprix82

Post Number: 485
Registered: Jan-06
If a square port is 20"H x 5"W would that equal up to 50sq.in.?
 

Silver Member
Username: Jprix82

Post Number: 486
Registered: Jan-06
it didnt bump
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 2646
Registered: Mar-04
no...thats 100sq inches.

area = lengh x width
 

Silver Member
Username: Jprix82

Post Number: 487
Registered: Jan-06
can you give a example of a 50sqin port?
 

Silver Member
Username: Jprix82

Post Number: 488
Registered: Jan-06
it didnt bump
 

Silver Member
Username: Safe_cracker

Chicago, IL US

Post Number: 707
Registered: Jan-06
Just remember, if a port doesn't fit inside, doesn't mean it cannot go outside! Polo.. :-O
 

Silver Member
Username: Graphix1

Santa Rosa Heights, Arima Trinidad & T...

Post Number: 842
Registered: Oct-05
"but, slot ports are cheaper"

wait pvc is more expensive than mdf...WTF!!
 

Gold Member
Username: Southernrebel

Monroe, Louisiana USA

Post Number: 2654
Registered: Mar-04
nester...usually when you buy MDF to build a box, you have plenty left over to do a slot-port. (unless you build a fvckin huge box)

a 50sq in square port would be:

10" x 5" = 50sq in
2" x 25" = 50
12.5" x 4" = 50
 

Silver Member
Username: Graphix1

Santa Rosa Heights, Arima Trinidad & T...

Post Number: 843
Registered: Oct-05
oh right right...now i get ya..

i was wondering cause 3" pipe down here is equivelent to like 50c a ft
 

Silver Member
Username: Jprix82

Post Number: 489
Registered: Jan-06
oohh i got ya, so this would be 75sqin right?
image/bmpUpload
port.bmp (73.8 k)
 

Silver Member
Username: Safe_cracker

Chicago, IL US

Post Number: 710
Registered: Jan-06
You also have to remember that a round port will play more frequencies than a slot port which will peak more around its tune. Polo..
 

Silver Member
Username: Terry6405

Sullivan, IN US

Post Number: 632
Registered: Sep-05
there is a reason aero ports cost more, they are better

i invested in 4 - 4", should be coming soon
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