Online ROund Port calcs?

[bgowdy 5,000+ posts]

Im trying to work with these and figure out how its actually used. Like take the 12volt.com or Precision Port Sounds(PSP) calcs. They ask for the enclosures net volume before i know the aeroport displacement.

Are these calcs asking for Internal volume net ""BEFORE DISP""? it may be a noob question but not sure i understand it.

Click to read more...

 

[SMS 10+ year member]

yes they are

 

[bgowdy 5,000+ posts]

yes they are

thank ive tried it before but never asked even tho i didnt understand but this time i figured i would

 

[SMS 10+ year member]

nope, sorry i read that wrong here lookin for you to put in the net volume after all deductions.... sorry bout that

 

[bbeljefe]

Loudspeaker calculators and programs deal in net volume after displacements. So... find your tuning at a given volume and then add all displacements to calculate gross enclosure volume.

 

[bgowdy 5,000+ posts]

Loudspeaker calculators and programs deal in net volume after displacements. So... find your tuning at a given volume and then add all displacements to calculate gross enclosure volume.

really? honestly that kind of doesnt make since but it does at the same time. lol i know.... see now im kind of confused on how to do this

 

[basswiigee]

really? honestly that kind of doesnt make since but it does at the same time. lol i know.... see now im kind of confused on how to do this

lmao yup i'm too confused too... good luck bgowdy!!!

 

[bgowdy 5,000+ posts]

Loudspeaker calculators and programs deal in net volume after displacements. So... find your tuning at a given volume and then add all displacements to calculate gross enclosure volume.

what do you mean by this?

 

[bgowdy 5,000+ posts]

lmao yup i'm too confused too... good luck bgowdy!!!

idk if your being sarcastic, but to me it doesnt make sense to put in net volume after disp to get the lenths of ports.

 

[basswiigee]

idk if your being sarcastic, but to me it doesnt make sense to put in net volume after disp to get the lenths of ports.

no bro wasn't being sarcastic.. seriously your talking rocket science to me, lol i got to put my trust into someone with the know how... i do alright with torres but sketch up makes me wanna break stuff... so no personally made boxes in my future... i do wish you luck, cuz seriously i was trying to follow thread but got lost...

 

[bgowdy 5,000+ posts]

no bro wasn't being sarcastic.. seriously your talking rocket science to me, lol i got to put my trust into someone with the know how... i do alright with torres but sketch up makes me wanna break stuff... so no personally made boxes in my future... i do wish you luck, cuz seriously i was trying to follow thread but got lost...

Yea i know......... How the hell can you figure the lenths or ports with the net cubes of the box when you dont even know the port displacement with out the lengths of them yet....? make sense lol

 

[basswiigee]

lmao... there i go lost again lol seriously good luck bro...

 

[bgowdy 5,000+ posts]

lmao... there i go lost again lol seriously good luck bro...

i just found something that says you the the volume of the box minus the subwoofer displacement

 

[bbeljefe]

what do you mean by this?

Net volume is the amount of volume you need after all other displacements are figured in. Therefore, if you need one cube of net volume, your sub takes up .10 cube of volume and your port for that volume takes up .25 cube of volume, then you need to design a box with 1.35 cubes of gross volume. And then, once you've built the box and the port and have installed the sub, there will be 1 cubic foot of empty space left in the box.

To say it another way and to answer your question about how do you figure port length if you don't know volume... you do know volume. If you need 1 cube net then you add all other displacements before you design the box for gross dimensions.

I don't mean to condescend because I understand that it's confusing but... it's just addition. One cube plus .1 cube plus .25 cubes is 1.35 cubes. That's your target gross volume in the example I gave.

 

[bgowdy 5,000+ posts]

Net volume is the amount of volume you need after all other displacements are figured in. Therefore, if you need one cube of net volume, your sub takes up .10 cube of volume and your port for that volume takes up .25 cube of volume, then you need to design a box with 1.35 cubes of gross volume. And then, once you've built the box and the port and have installed the sub, there will be 1 cubic foot of empty space left in the box.
To say it another way and to answer your question about how do you figure port length if you don't know volume... you do know volume. If you need 1 cube net then you add all other displacements before you design the box for gross dimensions.

I don't mean to condescend because I understand that it's confusing but... it's just addition. One cube plus .1 cube plus .25 cubes is 1.35 cubes. That's your target gross volume in the example I gave.

so i seems i do it the same way just kind of backwards