Tube port to Slot vent

.7854*d*d=area 4" port would be .7854 x 4 x 4=12.57"

 

as long as the port area is the same between a slot vent and a round vent the lengths will be the same

 

a round port and slot port both do the exact same thing

two ports with the same area...one a round port and a one a slot port...the round port would outperform the slot port

a 3 inch diameter port would be equivalent to a square slot port 2.7 inches by 2.7 inches

where did you get that 3x18.40 number???? that would be 55.2 sq inches of port compared to a 3 inch diameter port with about 7 sq inches of port...way off

 

2.7 x2.7 square has the same area of a 3" round circle...the legnth will be the same. what is the size of the box?

 

first 3' means three FEET

well basically use simple algebra.

both a round port and slot port will have the same tuning given they both have the same port area and port length.

area of a circle is

A = pi X r^2

area of rectangle is

A = l X w

to convert from round ports to slot ports first find the area of a round port

for pi we will use 3.14 as it is rounded

ex: 4 inch diameter port

A = 3.14x2x2

A = 12.56 sq in

So using A = length x width for a rectangle (durr)

A = and two numbers you want that equal 12.56 sq in

Easy way....find how tall you want your slot to be...say 5 inches.

12.56 = 5x

solve for x, x is your width of the port

12.56/5 = 2.512 in

so a 5 in x 2.512 in slot port will have the same port area as a 4 inch diameter port...you can make the dimensions of the slot port whatever size you want...but just make sure it isn't long and narrow like say a 12.56 inch tall port by 1 inch wide

 

Hey AZN you scare me, can we simplify this a little bit

Please

mrmizcue has the right idea but I think we can take his idea and make it easier to use (we are not all math majors).

What if we call the diameter of the round port the width of the port, then we get

0.7854*width*width = width*height (then divide both sides by width)

0.7854*width = height (now we have something easy to use)

So if we have a 4-inch round port and we want square, our width will be 4 and our height will be 3.14-inches.

Don't like those dimensions, no problem. If we double 3.14 we get 6.25 (I'm rounding off) just remember to do half the other dimension to 2-inches.

In other words, if you wanna adjust the dimensions its easy, multiply one side by some number "n" and divide the other side by that same number.

n*(0.7854*width) = height/n

(AZN you dont need to tell me that multiplication is associative and I don't need the parenthesis on the left hand side, I already know)

I wonder if this can be simplified even more??

 

lol...well i was just typing what was going through my head haha

Yes ranger i'm sure you can simplify it even more...I'm still in math211 !!!!! lol

I'm working on it though

 

lol i don't really know what kind of point you are trying to make here haha

either a mean one or a joking around one...lol

I think you are just f'in around

 

haha aight....though you were messin around

got any new pics to post up?

 

we were just trying to help. that is all. you asked a question and we answered. the answer i gave was the simplest that i know of. I am 37 and a mechanical engineer and I too had a GREAT time in '88-'92...collage years. drinking and drugs kill brain cell's...but only the weak one's....only the strong survive!!!!!!

 

I'm 48, so your only off by 28 years. I know that your kidding around, but sound is physics. Relationships in physics can be explained mathematically.

Car audio is no different, mathematical relationships between enclosure, driver and vehicle do exist. When we open our eyes and see them, we can go far.

AZN is a great example, he has seen the relationships and has developed his own methodology. The point is that he has seen the mathematical relationships and he understands their importance.

Math is power (and I hated math when I was in High School)

LOL!!!!!!!!!!!!!