Physical Port Length vs Port Length

[Carroot1]

You have too much port area. I think you want 3 port walls for an "L" port

no i dont want an L port and the port area is fine

[hdorre]

the port area is fine

Why are you asking if you don't listen to advice? The damn application says you have too much port

Edit: I mis-understood something

Edited October 3, 2010 by hdorre

[Torres]

i did not build my calculator according to JL audio, so of course it will differ.

cashdollar, thanks for posting your amazing paint skillz you are pretty much spot on except for the common walls. when looking at the port head on, common port walls is how many sides of the box share the face of the port. so yes, as hdorre said you'd want 3 common walls.

but yes physical port length is just that, the length of the physical port. the wood is the physical part. it's the inner part of the port, so it does not need to be as long because in instances where the port bends, the 90º angle accounts for the 'loss' of the port length. the effective port length is the cyan colored port length that is pictured above. aka the port length you enter into the box.

ignore the end correction. the calculator already takes that into effect when doing slot ports.

[Torres]

Why are you asking if you don't listen to advice? The damn application says you have too much port

just too much according to the 'rule of thumb' rule. i think i'm going to take that box out because it's just that, a general rule of thumb and not a set rule to go by. not a 'right or wrong' case, unless there's something like 5 sq inches per foot lol

[hdorre]

just too much according to the 'rule of thumb' rule. i think i'm going to take that box out because it's just that, a general rule of thumb and not a set rule to go by. not a 'right or wrong' case, unless there's something like 5 sq inches per foot lol

I didn't realize the app went by the "rule of thumb" rule. I thought it calculated the recommended some other way by using math. My bad

[Torres]

nah you're fine . i put that there for people that were new and weren't aware of how much port area to use as a thing to go by. but...in lots of screen shots i've seen, it doesn't quite seem to help. i really have seen it get down to 5 sq inches per foot lol.

to my knowledge there is no set rule on port area. it all just varies from application to application.

[MrSkippyJ]

i did not build my calculator according to JL audio, so of course it will differ.

cashdollar, thanks for posting your amazing paint skillz you are pretty much spot on except for the common walls. when looking at the port head on, common port walls is how many sides of the box share the face of the port. so yes, as hdorre said you'd want 3 common walls.

but yes physical port length is just that, the length of the physical port. the wood is the physical part. it's the inner part of the port, so it does not need to be as long because in instances where the port bends, the 90º angle accounts for the 'loss' of the port length. the effective port length is the cyan colored port length that is pictured above. aka the port length you enter into the box.

ignore the end correction. the calculator already takes that into effect when doing slot ports.

This is why I said I was guessing, I don't know to much about ports. I didn't realize physical port was not a standard measurement. Now I know

[hdorre]

i really have seen it get down to 5 sq inches per foot lol.

to my knowledge there is no set rule on port area. it all just varies from application to application.

Haha..too funny

Yeah, I read that explorers like more port area.

[moetpoppin]

good to know

and will take that into account for the next box build