Yet another question about pollyfill...

[Afboy143 10+ year member]

yes it does lol u dont understand how bad i am at math, but here i took the dimentions im gonna make a picture and draw it hold on

 

[Afboy143 10+ year member]

Here are the measurements of the box, now can someone help me? THanks oh btw the wood is 1/2 particle board. Yes i know its thin but it works great for me

 

[Afboy143 10+ year member]

**** forgot the pic lol

 

[Gauntlet 5,000+ posts]

Originally posted by Afboy143 Here are the measurements of the box, now can someone help me? THanks oh btw the wood is 1/2 particle board. Yes i know its thin but it works great for me

I don't see any dimensions. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

Basically, in your mind separate the L shape into 2 squares/rectangles. Take the outer dimensions of the first , factor out the length of the particle board, multiply the 3 numbers together, then divide by 1728. Do the same for the second one. Add the 2 numbers together, and there ya go.

 

[Gauntlet 5,000+ posts]

Ah...n/m I see the pic now...but I need the height of the box.

 

[Afboy143 10+ year member]

the height is 17.5 inches on the long end and 10.5 on the other end where the L is

 

[Gauntlet 5,000+ posts]

No....I need to know how long across the box goes, you just gave the side dimensions...

In this picture....I need to know the length of the black area, where all the question marks are....

 

[Afboy143 10+ year member]

Ah thats hard to explain, the whole box starts out at 7 inches at the bottom and angles up and its 3 inches at the top

 

[Afboy143 10+ year member]

Its a slanted L shaped box is what it is

 

[jlaine 10+ year member]

Originally posted by Afboy143 Well today i made a box for my truck, and i stuffed it full of pollyfill. Its filled every lil bit is pollyfilled on the inside. Im not sure how much airspace is in the box to b truthful cuz im not good at all with math. Well the real question i was asking is, is there such thing as "over polly filling" a sub box? Should i take some out or what? Thanks guys

You overstuff it, you go completely back-asswards from what you were attempting to do in the first place...

18ozs per cubic foot, hold it to your chest and remember it...

Best happy medium for poly.

 

[jlaine 10+ year member]

Originally posted by evo2k3 no...that would defeat the purpose of increasing air movment.

Incorrect, you can still use polyfill in a ported enclosure - it's been done with well-documented results showing the gain one would be after if they were doing it to a sealed chamber.

 

[Gauntlet 5,000+ posts]

Originally posted by Afboy143 Ah thats hard to explain, the whole box starts out at 7 inches at the bottom and angles up and its 3 inches at the top

Ok.....so.....in my picture, where it says 7 inches.....it's only 7 inches there, and slants down to 3 inches at the other end of the box? What about the 10.5 side? Does it slant down to 3 inches as well, or a different length?

And I still need to know the actual length of the box....where all the question marks are in the pics....

 

[Afboy143 10+ year member]

Alrite well hey Gauntlet, thanks for all the help but i just ended up taking all the poly fil out and just put 20 oz in and its a lot louder and deeper now and it hurts the ears. I dont really wanna keep messing with this, i told u i was bad with math :/ thanks neways man

 

[evo2k3 10+ year member]

Originally posted by jlaine Incorrect, you can still use polyfill in a ported enclosure - it's been done with well-documented results showing the gain one would be after if they were doing it to a sealed chamber.

then why isn't it done more? it also complicates tunning because the poly "alters" the volume the sub sees correct? is there a forumla for how much poly changes the volume? I always thought it was rather random and entirly too abitrary to calculate a tuning freq......right or wrong?

 

[jlaine 10+ year member]

Originally posted by evo2k3 then why isn't it done more? it also complicates tunning because the poly "alters" the volume the sub sees correct? is there a forumla for how much poly changes the volume? I always thought it was rather random and entirly too abitrary to calculate a tuning freq......right or wrong?

................. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Tuning is overrated.

http://www.win.net/audtatious/audio/fiber.html

As a given port length stays identical, and box size increases... Tuning will effectively lower... most guys will like that...

Oh.. and the projected 43% rough enclosure size gain is a plus too. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif