ExpoSport's (Torres) GUI-based Box Tuning Calculator

[mazdakid 5,000+ posts]

why does clicking sub upward lower the port length by 10"?

 

[ExpoSport 10+ year member]

because the port needs to bend, so the 'physical' length just needs to be shorter but if you measure down the middle of the port you'll notice it's the same length

 

[Fuknmovin 10+ year member]

Cool, that's about what I figured...

 

[mazdakid 5,000+ posts]

So if you have a bend in the port then where does the physical port length number come from?

ok i make my port length 16" and heres what i get



if i make my port 17" then i get this



why does the physical port length get smaller when i make the port length longer and need a bend?

 

[ExpoSport 10+ year member]

physical port length is the length of the wood. in the first one, the port does not need to bend so therefore it's the full length. in the second one, it has to bend, so it doesnt need to physically be as long as you have entered in the box. somewhat similar to this:

caption should explain it. but the physical port there is 10" long, while you're getting a longer actual port length (the small purple length is end correction of the port)

 

[mazdakid 5,000+ posts]

That still doesnt make sense to me. So if i need a bend in the port, then my piece of wood needs to be smaller than if i didnt have a bend?

 

[Fuknmovin 10+ year member]

I think what he is getting at (if I understand correctly) is that the physical port length and what the woofer actually thinks the port is are two different things and he is accounting for the little extra length you "theoretically" get in certain situations............... Right?

 

[ExpoSport 10+ year member]

that is exactly right. if you look at the diagram i posted, the physical length is 10", yet the *actual* length is longer (measured down the middle). if you made that box say twice the size with the port staying the same, then the curve in the box would not technically extend the port length since it's much further away. it'd be just 10" (minus end correction). you wouldnt have that purple and brown length measurement added into the port length. so the port length is the same, just the material needed to make the port is different.

 

[matt_martin87 10+ year member]

I made my own tiny program in excel but this absolutely blows it out of the water. I found it relatively easy to use once I started seeing how the output numbers changed as I messed with the other variables.

This should be a sticky. Or at least included in a sticky for ported box calculators.

 

[ExpoSport 10+ year member]

//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif thanks man glad you like it!

 

[Ali1 10+ year member]

Sticky.....

 

[ExpoSport 10+ year member]

just a little bump is all //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Coltsrock 10+ year member]

new years bump!!

and call for a sticky, this is a great prorgram

 

[ExpoSport 10+ year member]

thanks!! appreciate the kind words. soon, hopefully really soon, i'm going to have metric worked into it for people across the pond. plus a new thing or two, more so just visual things.