Gross Volume, Net Volume, & Tuning Frequency..Im Confused

[Mdjai 10+ year member]

I think maybe I'm making this harder than it is but...

Im not understanding how to determine what port length i need, bcuz i dont know what volume to use. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

I need the net volume to be 3.2 cubic feet after port displacement/ 3 cubic feet after port AND sub displacement.

Now.... this is where I think I'm screwing up. I am punching 3 cubic feet and the square inches of the slot port i want into the calculators to get how long the port needs to be...is that correct???

But then i dont get it... bcuz after it tells me the length of the port necessary for the tuning frequency im after, its displacement will make the net volume no longer 3 cubic feet.

Or do I punch in the max dimensions that I want the box to be, then punch in the desired square inches of the port and tuning frequency... then when it tells me the vent length necessary, find out the displacement of the vent, subtract it from the gross volume of the max dimensions and see if it is 3.2 cubic feet??

I am confused, and i wouldnt be surprised if someone that knows their stuff reads this post and then gets confused themselves, lol.

But PLEASE help me, thanx:fro:

Click to read more...

 

[Mdjai 10+ year member]

wow, i made this thread before i saw the sticky on designing a ported enclosure

sorry

Please delete this thread thanx:fro:

 

[ngsm13 5,000+ posts]

I answered your questions via PM, you seem to have gotten it!

nG

 

[Mdjai 10+ year member]

I answered your questions via PM, you seem to have gotten it!
nG

Yeah, i just got your messge and replied about 2 minutes ago.

THANX ALOT man //content.invisioncic.com/y282845/emoticons/fro.gif.c695f1f814b01c4ad99fe7f8cccadd29.gif peeeeace

 

[nauc 10+ year member]

use this

http://reaudio.com/speaker_box/LPort_Box_Calc.html

 

[ngsm13 5,000+ posts]

use this
http://reaudio.com/speaker_box/LPort_Box_Calc.html

That is completely and UTTERLY incorrect.

Horrible.

nG

 

[youngstunna 10+ year member]

i duno i think that box calculator works cause scott gave me box dimensions and i put them in that to see if the box calculator was anywhere near correct and to my surprise it was bascially straight on

 

[spoonraker 10+ year member]

Sometimes it works sometimes it doesn't from what I've heard. I would just stay away from it, there are other calculators or if you just do the math yourself you know you will be ok.

 

[ngsm13 5,000+ posts]

i duno i think that box calculator works cause scott gave me box dimensions and i put them in that to see if the box calculator was anywhere near correct and to my surprise it was bascially straight on

It doesn't give you options though...

nG

 

[youngstunna 10+ year member]

what kind of options?

 

[ngsm13 5,000+ posts]

Any other options... port area...all the shit you want to be able to change yourself...

nG

 

[Flipx99 5,000+ posts]

I use the port calculator at psp....

 

[youngstunna 10+ year member]

yea but it still works id use it

 

[Mdjai 10+ year member]

haha, i tried to get this thread deleted in my 2nd post and ended up getting like 12 replies. Not bad, lol.

 

[IgnoreMe 5,000+ posts]

i duno i think that box calculator works cause scott gave me box dimensions and i put them in that to see if the box calculator was anywhere near correct and to my surprise it was bascially straight on

or Scott used the calculator to give you your design...