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Discussion Starter #1
tossin around the idea of putting in four 10s in my trunk. reason being space is an issue and i listen to some punk , so a snappier sub would work best for that i think. i also like pushin spl though aswell on occasion, so im hoping four of them will still get the rear view mirrors flappin when needed.

my question is then how do i measure the box for the proper volume so the subs opperate properly.
how can i figure it out to see if they will even fit in the space i have?

input and oppinions please :dunno:
 

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to calculate what you have available you need to get a rough height, length, and width of the area your working with.

Then the calculation is as follows:

length x width x height/1728

1728 is 1 cubic foot. (or 12 x 12 x 12)

Then to figure out if you have enough space for the subs read what the owners manual recommends for air space.

So for example if you figured out you have about 5 cu ft. of space in your car. Each sub takes 1.8 cu ft. (just pulling the numbers out of left field) after displacement then you don't have enough room.

Make sense?
 

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Oh yeah...and as a side note, once your box is complete if you measure the inside dimension of the enclosure and then subtract the subs displacement you will have your total net cubic feet! ;)

If your going to get into fiberglassing there are other ways to calculate. ;)
 

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Just a suggestion

Make a sealed box (same specs as you would)only fire it down as in the subs facing towards the bottom of the trunk.Now build it up 3-4" on 3 sides.Leaving 1 of the sides open preferably the longest (if your making a rectangle) now face the open end toward the back of your trunk.Give it a whirl,i've done this to numerous sealed boxes and have always been impressed w/ them.
 

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Discussion Starter #6
thats perfect! exactly the info im looking for!!

so your saying sealed box subs facing in towards the box and the back of the box facing the pasanger compartment of the car?

i may have to rethink my lay out completley. im not sure i will have the space behind my tank after all. however proper volume measurement is what im realy after just to make sure i build it properly.
i have built stereos a while back but i want this one to be done right.
 

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Discussion Starter #7
Originally posted by 79 cutty@Feb 8 2010, 01:16 PM~16549839
to calculate what you have available you need to get a rough height, length, and width of the area your working with.

Then the calculation is as follows:

length x width x height/1728

1728 is 1 cubic foot. (or 12 x 12 x 12)

Then to figure out if you have enough space for the subs read what the owners manual recommends for air space.

So for example if you figured out you have about 5 cu ft. of space in your car. Each sub takes 1.8 cu ft. (just pulling the numbers out of left field) after displacement then you don't have enough room.

Make sense?
ok so just to make sure im following.
i have a box thats one foot x one foot x 2 feet. so i times 4 x 1728?
 

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Originally posted by matttatts@Feb 8 2010, 07:44 PM~16553528
ok so just to make sure im following.
i have a box thats one foot x one foot x 2 feet. so i times 4 x 1728?
No...you multiply 12 x 12 x 24. Cubic feet is calculated using the number of inches. Then when you divide by 1728 that gives you the cubic feet.

In that situation your box is 2 cu. ft.
 

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Originally posted by 79 cutty@Feb 10 2010, 01:28 PM~16571632
No...you multiply 12 x 12 x 24. Cubic feet is calculated using the number of inches. Then when you divide by 1728 that gives you the cubic feet.

In that situation your box is 2 cu. ft.
and small as fuck for 4 10's. I had 4 infinity reference 10's in 4 cubes sealed and they wanged.
 

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Originally posted by Airborne@Feb 10 2010, 10:34 AM~16571681
and small as fuck for 4 10's. I had 4 infinity reference 10's in 4 cubes sealed and they wanged.
You got any vids of that? Would be interested in seeing that! I had a buddy who bought my RF Power PUnch HX2 12's and put the 2 of them in a 3 cu ft sealed box....it was a sad day for those subs. Sounded pretty clean....but did not put out at all!
 

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Originally posted by 79 cutty@Feb 10 2010, 02:27 PM~16572072
You got any vids of that? Would be interested in seeing that! I had a buddy who bought my RF Power PUnch HX2 12's and put the 2 of them in a 3 cu ft sealed box....it was a sad day for those subs. Sounded pretty slean....but did not put out at all!
No vids, I gave them to a soldier of mine at my last duty station. I got the subs on clearance for like $28.00 each at the PX. Couldn't pass it up. I was pushing them all with my Directed 1500d.
 

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Here are a couple calculators that may help you achieve the volume you want.

http://www.carstereo.com/help/Articles.cfm?id=31 ~ most accurate IMO

http://reaudio.com/speaker_box/LPort_Box_Calc.html
RE Audio ~ kinda accurate (shows a lower tuning then actual). makes a Great cut sheet list though.

http://www.diyaudioandvideo.com/Calculator/Box/

Lalena ~ round ported calculator as well as sealed (lets you see the boxes resonant frequency for sealed. pretty sweet)

http://www.klausaudio.com/

Klaus Customs ~ fairly accurate, Great cut sheet, Just click the box you want to make then click customize and fill in the blanks.. It maximizes the space you got... Pretty solid

http://www.bcae1.com/spboxnew2.htm

BCAE Sealed/ported enclosure ~ never checked it's accuracy for ported but the sealed one is great

http://www.diysubwoofers.org/misc/portcal.htm

DIY calculator ~ calculating the port with the formula.. Have your scientific calculator handy :cool:

http://www.the12volt.com/caraudio/boxcalcs.asp#rec

the12volt.com
 

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Discussion Starter #13
got it thanks again!! math has never realy been my strong suit lol.

those arent the measurments of my actual box it was just an example
 
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