Having a very hard time getting help. PROS ONLY!

[GAM3OVR 5,000+ posts]

what calculator did you use? i used the one on 12 volt but apparently it way off. what did you figure for sub displacement? I was figuring .22 for a 12"

I use pencilandpaper.do application

you should try it sometime

 

[mendon mafia 10+ year member]

I use pencilandpaper.do application
you should try it sometime

So your bad at math then? how on earth did you get 1.93?

I get 2.04 without the little nook in the corner near the port with the nook in the corner i get and extra .165 totalling 2.205 cubes net before driver displacement. Subtract .2(.1) for sub displacement and perfect 2(2.1) cubes net.

I use pencil and paper before i build any enclosure. I just use the re calcs and others to get close before i draw. they predict volume perfectly every time you just gotta figure the sub displacement on your own since it doesn't account for that. And port length i use the 12volt

is there a better calc out there i should use for port length? im not sure how to calculate port length by pencil and paper. This is like the 10th enclosure ive built and the only one ive had a problem with so i doubt its the calc anyways rather than just my massive port area.

It doesn't matter cuz 2 cubes is not the right size anyways and the box size is less of a problem than my port size probably

 

[GAM3OVR 5,000+ posts]

with the exact sub displacement and not counting the corner of the port where it end(port entry)

1.93 something is what I got.

 

[mbrooky 10+ year member]

bigger pic...build it!//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[mendon mafia 10+ year member]

with the exact sub displacement and not counting the corner of the port where it end(port entry)
1.93 something is what I got.

so your just ignoring that corner? you gotta either count it as port length or box volume. But yea i see the 1.93 now but its still wrong.

bigger pic...build it!//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

Im going to build it slightly different. 36 wide, 19 deep, 13.5 tall. port area is 48" tunes to ~34 hz. This will seal to the cabin of my car better than 32" wide. I only need a small foam gasket to seal it off if its 36 wide.

I want to try to do a kerfed port opening as well as for the port bend. You only count the opening as half the length right? ie. if the port flare is a 4" radius only 2" will count to port length?

Heres a pics. Notice that the blue port length line dosnt go all the way to the ends of the port openings.

 

[mendon mafia 10+ year member]

so your just ignoring that corner? you gotta either count it as port length or box volume. But yea i see the 1.93 now but its still wrong.


Im going to build it slightly different. 36 wide, 19 deep, 13.5 tall. port area is 48" tunes to ~34 hz. This will seal to the cabin of my car better than 32" wide. I only need a small foam gasket to seal it off if its 36 wide.

I want to try to do a kerfed port opening as well as for the port bend. You only count the opening as half the length right? ie. if the port flare is a 4" radius only 2" will count to port length?

Heres a pics. Notice that the blue port length line dosnt go all the way to the ends of the port openings.

No help here?