Calculating Cu. Ft. in a glass enclosure
Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=30309
Printed Date: May 31, 2024 at 7:25 PM
Topic: Calculating Cu. Ft. in a glass enclosure
Posted By: team_outkast
Subject: Calculating Cu. Ft. in a glass enclosure
Date Posted: April 13, 2004 at 12:58 PM
Can anyone help me on what to use to calculate this???i mean i can get close but im a perfectionist and i like my music to be tuned to the proper hertz,is this possible or close to possible in some way..((especialy in a all glass mold??))thanks for any help regarding this......Team_Outkast
-------------
Team_Outkast
Replies:
Posted By: defective
Date Posted: April 13, 2004 at 2:29 PM
i cant help with all glass but i do know one trick. For a tire well enclosure, put four garbage bags inside each other, then fill with water till it fills to the top of the tire well....... then just use a measuring cup and count your scoops. You can then convert that to Cu. Ft. If you are building with the spare tire in the trunk, Take that tire and push it into a large bucket, situated in a wading pool. Then get you measuring cup out again...... For the all glass..... if it is ALL glass, it should be airtight. Fill it with water and count scoops. BTW: not recommended with MDF!! It's like a sponge -------------
Posted By: sam1
Date Posted: April 13, 2004 at 5:40 PM
no dont use water. thats just a pita. go get some packing peanuts, bean bag beans, or anything similar and pour it into the enclosure until you fill it to the top. then get yourself a 12x12x12 box and see how much you fill it by pouring the peanuts from the enclosure into the measuring box. you can use any box really tho, as long as you have marks where 1 cu ft is.
Posted By: pureRF
Date Posted: April 13, 2004 at 6:19 PM
If you can get anything smaller than packing peanuts that would get a more accurate volume. but either will work
-------------
dream it, build it, fiberglass it
Posted By: pureRF
Date Posted: April 13, 2004 at 6:20 PM
If you can get anything smaller than packing peanuts that would get a more accurate volume. but either will work
-------------
dream it, build it, fiberglass it
Posted By: kickerstang
Date Posted: April 14, 2004 at 12:14 PM
i would recommend sand personally, it much finer and you can get very very accurate, and use something like a small box or bucket that you know the exact airspace inside, don't use a 12 x 12 x 12 box because what if your enclosure is not exactly to the cubic ft. what if it's like 3.3ft3 if you use a 12 x 12 x 12 box your final measurement will have you guessing somewhere inbetween one cubic foot and the next. use something smaller so you can get a more accurate measurement
-------------
what!?!?! you want some??
Posted By: sam1
Date Posted: April 14, 2004 at 12:41 PM
i just suggested the 12x12x12 box because thats the easiest. just take out a cuft at a time, then with the last one make a mark and measure how far from the bottom it is in inches. then just divide that by 12 and youve got youre decimal. i also suggested the bean bag beans because they are the easiest to clean up and they are relatively small. sand would be more precise, but not enough of a difference to matter imo.
Posted By: defective
Date Posted: April 14, 2004 at 12:54 PM
 i still like water....
-------------
Posted By: sam1
Date Posted: April 14, 2004 at 1:29 PM
water would actually be the most accurate. just dont spill=)
Posted By: dangerranger96
Date Posted: April 14, 2004 at 5:42 PM
water will be more accurate if you don't spill any, sand will be accurate, but will be a pain to get all of it out, bean bag bean, or even dried peas will get an accurate reading but be easy to get out and handle
Posted By: framedragger
Date Posted: April 17, 2004 at 9:36 PM
water seems like it would be a bad idea cuz i know someone would be stupid enuff to put it in, and not dry it COMPLETELY, then you have 12 volts runnin through wires and ur car catches fire, but then again, to the one who has or is going to do it.......u most likely deserve it
Posted By: audiomechanic
Date Posted: April 18, 2004 at 10:14 AM
one other thing you can do is mark the square box in .25 cubic foot increments. this will help you be a little more exact when you are measuring. i have always used the packing peanuts and it has worked very well.
another option is to make an adjustable port. that way you can test it once it is done and tune it the way that you want it to sound.
-------------
Posted By: kenbc73
Date Posted: April 25, 2004 at 1:34 PM
I would get some type of frequency generator and actualy tune your enclosure to your liking.Just play with the port length in the general volume you think your close to.When the woofer stops moving but is very loud that is what your tuned to.
|