calculating box volumes
- Thread starter Stilgar
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Yeah, do the (Base * Height * Length) / 2 calculation, but you need to break up the box into shapes first. If you can isolate the triangle where you’re left with a triangle and a square calculation, do that. Or you might have to break the shape up into several triangles, squares, etc.
1) Fill it with water and then pour the water in a graduated cylinder.
2) If the box is solid, fill a bowl to the very edge with water and then submerge the box, capture the over flow in the graduated cylinder to see how much volume the box displaced.
3) Use a CAD program and interogate properties of the box.
4) Count the number of decibels.
2) If the box is solid, fill a bowl to the very edge with water and then submerge the box, capture the over flow in the graduated cylinder to see how much volume the box displaced.
3) Use a CAD program and interogate properties of the box.
4) Count the number of decibels.
Gogo gadget mspaint!
Should be around 29 litres or 1 cubic foot according to the prior owner of the awesomely rendered subwoofer.
Should be around 29 litres or 1 cubic foot according to the prior owner of the awesomely rendered subwoofer.
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I should have said that in the first place :? I just hope the magnet structure is short enough to fit in. I'm trying to fit the box right behind the rear seats... I drive a 2 door coupe and the space between the parcel tray and the floor of the trunk is teeny tiny.
Oh, if those measurements are taken from the outside of the case, i need to know how thick the material (wood) is because we need the dimensions on the inside of the case.
Those are the inner dimensions in centimetres. I'm no good with inches. I have no way of finding the exact volume of the sub because it's was custom built to order years ago. Hopefully it shouldn't be much of a problem as the sub was previously running ok in 0.75cft. The extra space is a recommendation.
The sub chassis is 10.5 inches in diameter and around 7 to 8 inches deep.
The sub chassis is 10.5 inches in diameter and around 7 to 8 inches deep.
Hey, never mind, i don't know what i was thinking. I copied your drawing to paper and did it wrong which messed me up. I can calculate that with the given info.
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Ok, depending on the woofer but do a wedge but not to a straight sharp edge.
Give it another flat side you will get more cubic feet,I do have a speaker building program, if you have all the specs for the woofer you might make me do a few correct box desighns for you.
If you don't have the specs then just make it as big as possible, but with the specs I could give you port hole sizes and lenghts, all thiel type box desighns.
Bandpass boxes would be way to big, and heavy, closed box desighn the box would be smaller, but mainly if the box is not right you dramticaly kill the power rating and sound.
1 12inch or a pair of 10 inch would be tons better too btw. or even a pair of 8inch would be better than one 10 inch.
I made some killer little 6.5 inch 2 ways for my bench and they are astounding, i even sold a pair ,they fricking rock like I can't believe.
Give it another flat side you will get more cubic feet,I do have a speaker building program, if you have all the specs for the woofer you might make me do a few correct box desighns for you.
If you don't have the specs then just make it as big as possible, but with the specs I could give you port hole sizes and lenghts, all thiel type box desighns.
Bandpass boxes would be way to big, and heavy, closed box desighn the box would be smaller, but mainly if the box is not right you dramticaly kill the power rating and sound.
1 12inch or a pair of 10 inch would be tons better too btw. or even a pair of 8inch would be better than one 10 inch.
I made some killer little 6.5 inch 2 ways for my bench and they are astounding, i even sold a pair ,they fricking rock like I can't believe.
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Well, I come up with 1.87 cubic feet. Don’t know if you want that in feet or centimeters. I’ll double check my results, but I think that’s right.
Anyway, the box has a volume of about 2 cubic feet before the speaker is in there. The speaker takes up about 0.22 cubic feet. However, I had to guess at the speaker dimensions. I figured the speaker didn’t come to a point, so I assumed it was about 3 inches round at the magnet. I used the height at 8 inches.
I’ll check again. I’m watching a TV show while doing all this, so I’m sort of distracted.
Anyway, the box has a volume of about 2 cubic feet before the speaker is in there. The speaker takes up about 0.22 cubic feet. However, I had to guess at the speaker dimensions. I figured the speaker didn’t come to a point, so I assumed it was about 3 inches round at the magnet. I used the height at 8 inches.
I’ll check again. I’m watching a TV show while doing all this, so I’m sort of distracted.
Ok, I wanted to double check since I wasn’t focused (watching a good show right now) and good thing I did because I made a mistake. The box has a volume of just over a cubic foot before the speaker goes in (1.04). This time, I made the magnet of the speaker 4 inches instead of 3. Anyway, after the speaker is in, you have a volume of about 0.81 cubic feet, or 23,032 cubic centimeters.
ReD_Fist said:
I used to have a 12 in a sedan but it was in a generic sealed box. Still went boom boom tho. I was running it on a phoenix gold ZX500 (got to love the way american brands over-engineer stuff!)
I was told by the original owner that this sub (not the 12) was made specially to spec for SQ in a sealed enclosure. It's a top quality brand (Arvus) but they are a very small NZ company who order custom spec speakers in low volumes (no model names just year of release... etc) so there's a **** show in hell of finding the thiele/whodingy parameters. I know it's 4ohms, nominal power handling is about 300wrms and it has about 7mm excursion in one direction.
Qualth: Thanks, I'll have to try Reds idea of adding flat corners for a little extra volume.
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The previous owner who said you needed 29 liters, or 1 cubic foot may have been talking about the volume of the case before the speaker was placed. You have that! You have just over 29 liters, or 1 cubic foot of box volume, so you might be fine.
I’d find out if that volume is before or after the speaker is inserted before I did a bunch of work for nothing.
I’d find out if that volume is before or after the speaker is inserted before I did a bunch of work for nothing.
It will be before the sub is installed or he would have mentioned it :tup: Those dimensons should work. I can always try jamming some neoprene into the box afterwards if things get a little boomy. (I'm told by reliable sources that the rubber tricks the sub into thinking there's slightly more volume inside the box)