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StickMe4myPaper
07-23-2011, 11:40 PM
From my understanding, the tuning of the box is determined during the building process. My question is, is there a way to figure out a box's tune after its been built? Might be a dumb question but ohhh well.

mast240
07-23-2011, 11:43 PM
yes... just figure out the dimensions of the box (internal cubic), and then the dimensions of the port... and that will give you your tuning

StickMe4myPaper
07-24-2011, 02:10 AM
so say like 1.5 cubes in each chamber (2 chambers) and a port thats about 16x4 just ballparking

mast240
07-24-2011, 02:13 AM
you'd also need the depth of the port... then i could figure your tuning

ace2u2003
07-24-2011, 02:54 AM
I am not meaning to jack this thread, it is some info I am looking for.

mast240, what about a form fitting box? I have a stock sub box that my car came with that I just want to replace the sub. I don't even know the cu is of the box because of the odd shape of it.


http://img.photobucket.com/albums/v518/ace2u2003/Audio/IMG_20110723_173728.jpg
http://img.photobucket.com/albums/v518/ace2u2003/Audio/IMG_20110723_173756.jpg

KyleBechtold
07-24-2011, 02:59 AM
for odd shapes you divide it up into regular shapes and get an approximate area.. triangles squares circles etc..

mast240
07-24-2011, 03:34 AM
yea... for odd shaped box's, its more of an approximation.... if you wanted to find EXACT size, and the box is plastic, like yours, you could always use water to find out the exact size... 7.5 gal = 1 ft cubed... just make sure its 1. completely sealed, and 2. you dry it out COMPLETELY before re-installing it, 3. theres no internal circuitry that could get fried from the water (i.e. stock internal amp)

StickMe4myPaper
07-24-2011, 09:46 AM
ok so once i get those measurements, how do you calculate the frequency?

mast240
07-24-2011, 10:15 AM
its a nice LONG equation... but there are a ton of calculators out there that u can use... just Google box tuning calculator... THE12VOLT.COM has some nice ones

ace2u2003
07-24-2011, 02:45 PM
mast240, i got as close as I can with it. It is about .15 cuft. This is a sealed box too.

mast240
07-24-2011, 02:50 PM
ok... i guess it had an 8 in it stock?

ace2u2003
07-24-2011, 03:01 PM
Yes, and a 8" is going back in.

mast240
07-24-2011, 03:09 PM
ok... so what are you asking?

ace2u2003
07-24-2011, 03:21 PM
What are the hz of the box so I will have the sub tuned right?

mast240
07-24-2011, 03:21 PM
if its a sealed box, there is no tuning bro

ace2u2003
07-24-2011, 03:24 PM
So just throw the sub in and I'm good?

mast240
07-24-2011, 03:25 PM
you wanna make sure its a good sub for that size sealed enclosure... some higher powered 8's will require more space for a sealed enclosure

ace2u2003
07-24-2011, 03:30 PM
Edit: Wrong post.