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  #1  
Old 02-04-2015, 12:12 AM
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Default Question about 45's in enclosure

How wide do the guys that use 45's in your boxes make them and how do I calculate how much volume they displace?
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Old 02-04-2015, 12:17 AM
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I personally make mine small as possible.
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Old 02-04-2015, 12:18 AM
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Originally Posted by LyferXB9s View Post
I personally make mine small as possible.
Wouldn't that make them less effective if they were too small? How small you talking? I was thinking like 3'' wide.
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Old 02-04-2015, 12:29 AM
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Is this how you calculate their displacement if they are 3'' wide and 20.5 tall and im using 4?
3*20.5= 61.5
61.5 *4= 246
246/1728= .1424 cubic ft
This will probably be the displacement for the wood but what about the area behind the 45?
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Old 02-04-2015, 12:36 AM
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I make them about 3'' wide. I don't account for them personally.
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Old 02-04-2015, 12:37 AM
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its just a triangle

((base*height *length) /2) / 1728 = v

you want 4 sides, so it'd be 4*v
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Old 02-04-2015, 12:41 AM
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Quote:
Originally Posted by crownvicon26's View Post
Is this how you calculate their displacement if they are 3'' wide and 20.5 tall and im using 4?
3*20.5= 61.5
61.5 *4= 246
246/1728= .1424 cubic ft
This will probably be the displacement for the wood but what about the area behind the 45?
What you are doing is just square feet, you need volume, you are missing thickness.

if you want to be completely accurate, the shape is a trapezoid after you are finish cutting into the shape, use this calculator (basically search up area of trapezoid on google)

https://www.google.com/search?source...7j0l5.3528j0j7

plug your measurements in then multiply by the length of the 45 and times 4 then divide by 1728
for example a 3 inch by 20.5 peice, in the calculator A would be around 2 after cuts to fit the corners, B would be 3, H would be thickness of mdf so 0.75 then times by the length which is 20.5

If the space inside is completely blocked off then it will be more like a triangle as someone else specified.

45s are supposed to be waveguides but work better for bracing the enclosure. 45s and bracing great if you have already accounted the room for excess bracing when you've planned your enclosure. If you are tight on space and have not set aside extra cubic feet for bracing displacement, then adding too much bracing and 45s can raise your tuning and you might not get the sound you are going for with your specified tuning.
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Last edited by jeffdachef; 02-04-2015 at 12:50 AM.
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  #8  
Old 02-04-2015, 12:42 AM
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Quote:
Originally Posted by Hdorre View Post
its just a triangle

((base*height *length) /2) / 1728 = v

you want 4 sides, so it'd be 4*v
Duh. Thanks bro.

So each 45 is .1 cube so that's .4 cubes for 4. That sound about right?
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Last edited by crownvicon26's; 02-04-2015 at 12:47 AM.
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Old 02-04-2015, 01:23 AM
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i got ~.11ft^3 of displacement for all 4 corners.

base would be 3, and length would be 20.5 according to you. Height would be somewhere around 1.6"

(((3*20.5*1.6)/2) / 1728) * 4
((98.4/2) / 1728) * 4
49.2 / 1728 *4
.028 * 4
~.112 ft^3
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  #10  
Old 02-04-2015, 01:34 AM
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Quote:
Originally Posted by Hdorre View Post
i got ~.11ft^3 of displacement for all 4 corners.

base would be 3, and length would be 20.5 according to you. Height would be somewhere around 1.6"

(((3*20.5*1.6)/2) / 1728) * 4
((98.4/2) / 1728) * 4
49.2 / 1728 *4
.028 * 4
~.112 ft^3
Ah ok. I had the height wrong. Thanks bro.
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