Port Calculators, How they work?

[Aeisuhr]

would more be better? and 40 with a narrow long port is different then 40 with a short wide port according to what you said earlier right?

[Triticum Agricolam]

More than 40 sq in would be better, but there are diminishing returns. Anything over 50 sq in isn't going to benefit you much.

As with any slot port, you want to keep the aspect ratio as low as practical, closer to square is better, but harder to implement. I try to keep aspect ratios below 5:1.

[Aeisuhr]

alright i think im closing in on understanding a bit, so should i aim for 50? and do you mean aim for a square port? also i assume the ratio is 5-1 as width-height?

I guess i just need to find out a way to figure out how to get a 50sq in port area in a 2-1 ratio to come out at 32hz... lol

[Aeisuhr]

i think i have what i need to do, only thing left is to be sure, im adding the port on the outside of the box, when i get my length that looks to be 24.89 in long on a 6*12 inch port that will wrap around the box. since its going outside i will have the full 5ft^3 inside, and going with 14.4in per cube, i get 72in port area. sounds a bit excessive but im liking that idea so, for the length of the port is it measured on the outer wall of the box or the outer wall of the port, or directly in the center? its harder since its going to make that L at the back of the box then another L as it goes into the center of the back where the internal opening will be

[Aeisuhr]

This Crude picture might help what im asking with the info provided above, im not sure why its so small you should be able to see it when you click to enlarge it

http://imgur.com/7h7Hdud

[ShadeTreeMechanic]

Now that's thinking outside the box! lol

The port would be measured in there center. Did you put any braces in the box? It would be a lot easier at this point to do aero ports since the box is already built.

[island boyeee]

that is certainly an interesting concept.. I think I looked at something like that many years ago, but don't remember if it's actually as efficient as a port inside the box... Subscribing to see what the knowledgeable folks have to say.

[Aeisuhr]

the more i think about it the more i really like the akward design of it, hopefully if its ineffecient somone will say so im waiting about 3-5 days before i get to building the port/finishing the box since its so hot right now.

[DLHgn]

i think i have what i need to do, only thing left is to be sure, im adding the port on the outside of the box, when i get my length that looks to be 24.89 in long on a 6*12 inch port that will wrap around the box. since its going outside i will have the full 5ft^3 inside, and going with 14.4in per cube, i get 72in port area. sounds a bit excessive but im liking that idea so, for the length of the port is it measured on the outer wall of the box or the outer wall of the port, or directly in the center? its harder since its going to make that L at the back of the box then another L as it goes into the center of the back where the internal opening will be

Just a FYI, taking the numbers you've provided, I have you to be tuned at around 35Hz. Just so you know. If you reduced your port to be 5*12 you would still be above that 50 in^2 mark (60), have an aspect ratio of 2.4 and be tuned at ~32 Hz. This is also assuming my calculations are correct (should be at least relatively close).

[Aeisuhr]

the calculator i used showed that was the right length and width for that height at 32, but your calculator is probably better then the browser one i was using to calculate port length.