Help me find enclosure tuning please

[Swordlordboy1234]

Bad at posting pics, or id just link it.

Its a PWK box design and i dont think im gonna use it but out of curiosity i wanted to see what its tuned to. Ive herd he likes to build 50hz fart boxes.

anyways.

Made out of 3/4 mdf, outside dims of this box are

32 wide

22 deep

14 high

The box is made of two chambers split in the middle with ports on the left and right side of box.

the box is 45'd in the rear corners of the box that read 1.75 inches long, and the two ports are 1.25 inches wide, 12.5 tall.

Let me know if i missed anything, or if someone can help me post the pics for easier viewing

Yes i know there is a very great calculator on SMD pinned in this section, being that i have an imac its not very helpful to me.

[Swordlordboy1234]

Zzz so many posts this was kicked off the bulletin board before I could get into bed and get iPad. "daily bump" lol

[Jessica]

how long are the ports?

[Swordlordboy1234]

18 inches

[Jessica]

Assuming the box is a 3 common wall design, like below then torres says it is around 36hz before any displacement. The more crap in the box like 45's and sub displacement raises tuining. I'm guessing it will be around 40hz after all is said and done. I can post a screenshot of torres if you want.

Here is a random pic of a 3 common wall box, not exactly what you have but you get the idea

[Swordlordboy1234]

No it's not a common box like that. So if yours posted is 40 hz then mine is way higher. My box has 2 chambers as stated above, with a wall between the 2 subs each sub has its own chamber and own port. A port is on both the right and left side of the box

[Jessica]

I know yours is two chambers, imagine that box mirrored left and right with a divider. Something like that?

[Swordlordboy1234]

Yeah now you got the idea. I wish I could just post the pic oh well. He told me to ssf set at 28 to not damage subs,mbut if it's tuned higher then 40 something like you stated.... Wouldn't the subs unload like crap? I was under the impression that you have about 10 hz below your tuning before you should worry about your ssf.

[Jessica]

I miss typed a number earlier.

I don't know for sure the exact tuning without knowing how much volume the 45's and subs displace. But just the box empty is tuned @ 33.7hz. So you may end up around 35 or 36hz after all is said and done, but thats just a guess.

The net volume is 1.99cuft before any displacement.

by the way, is the baffle single or double, because that will make a difference too.

Sorry for the mistake earlier.

[RAM_Designs]

Assuming .1ft^3 for sub displacement, it looks like you have about 1.85ft^3 per chamber with a tuning around 33hz. That's if the effective port length is the 18" that you described, and not longer due to how the port is situated in relation to the back wall(this will also affect the net volume I calculated due to the added displacement of a longer effective port length)...you might as well post the image if you want a more definite answer. just upload it to photobucket or any other hosting site, and simply copy/paste the url onto this page.