Hey swez i took a look at wedge two design from the previous post and i found the right measurements that will fit my trunk. It has 1.07cuft of air available.
My question is that i still have more room to use in the trunk and at the very peak box size my trunk is capable i can get 1.47cuft or air inside is that better or should i just stick with 1.07?
Replies (7)
swez on 07/6/2008 09:31:30
If you are talking 1.07 cf/chamber, (internal air space) that's plenty good for two GTO subs. (12's) Just remember that a wedge design is good when "H" restictions are fixed. We can limit/fix the "H", but have to make up for it in "D" & "W" dimensions.
Also, if you have at least 15" in "H" and a width of say 26-28 inches, you can use a rectangle and adjust the "D" to meet the sub chamber needs that way. Rectangles and cubes are much easier to design & build.
What are the max "H", "W" & "D" dimensions you have to work with in the trunk? (Be sure to look at any mechanical and side panel restrictions and account for them) If you don't, it will come back to bite after the box is done and won't fit. (Want to avoid that pitfall at all costs)
Swez
Zach1989 on 07/8/2008 02:23:43
40 inches wide, 15 inches tall, 15 inches in length, but it has a 20 inch vertical slant at maybe 30 degrees or so thats what i need to go with the wedge. and the slant stops 7 inches before the trunk floor.
W= 40
L=15
H1=15
H2=7
and i forget the other measurement but i think its 10 or 12 if im not mistaking.
swez on 07/8/2008 04:25:46
OK, I ran some calcs and it looks like the "Depth" dimension would be good at 12.0". That leaves a net 2.222 cf internal, minus the divider board and subs. That's pretty darn close
The divider board displacement will be roughly 0.05 cf. Most 12's are about 0.1 cf displcement. (0.1 + 0.1 + 0.05) = 0.225 cf.
Consider these values:
W= 40"
H1=15"
H2=7"
D = 12"
Board thickness: 3/4" MDF
FYI: If you buy a full sheet of MDF, (4' x 8' x 0.75") from most lumber stores, (Lowes or Home Depot) they can cut the sheet into smaller panels which are easier to transport and work on at home. The last time I did this, cuts 1 & 2 were free. Additional cuts were 50 cents each, but he was slow that day and did not charge for any cuts. That made it real easy to cart home and fabricate to final cut dimensions.
Comments?
Swez
Zach1989 on 07/9/2008 14:22:53
Wow thanks a whole bunch Swez you have really helped me out a lot since i got all my new stuff i cant even say how much i appreciate it.
That sounds good as far as i know the home depot does do the first two cuts for free but im not sure i havent bought mdf or any plywood in a while.
thanks again but having 2.22 cuft -.225 should be right at or just under 1 cuft of room per chamber if that is correct i presume, right?
swez on 07/9/2008 18:53:32
Yes, 2.22-2.25 cf nets ~1.0 cf per chamber.
(+/- 5% is very acceptable)
You're most welcome Zach!
Swez
Zach1989 on 08/1/2008 02:27:12
Hey Swez Sorry I havent got back to you guys sooner. I had a question about the divider board. Would it be just the 3/4" MDF cut to fit just like it was one of the sides? And that is what will make up the .05 displacement?
If that sounds confusing let me know and I will try to explain further into details.
swez on 08/1/2008 04:10:15
If you make the side panels such that they are interior panels and are capped by top, bottom, front and rear panels, yes... all 3 panels would be identical. (side A, B and divider)
It's best to plan out a box design on graph paper. This has 1/4" squares on the entire page and you can scale the drawing to the planned dimensions and see if it comes out right on paper before firing up the saw.
Swez
My question is that i still have more room to use in the trunk and at the very peak box size my trunk is capable i can get 1.47cuft or air inside is that better or should i just stick with 1.07?
Replies (7)
swez on 07/6/2008 09:31:30
If you are talking 1.07 cf/chamber, (internal air space) that's plenty good for two GTO subs. (12's) Just remember that a wedge design is good when "H" restictions are fixed. We can limit/fix the "H", but have to make up for it in "D" & "W" dimensions.
Also, if you have at least 15" in "H" and a width of say 26-28 inches, you can use a rectangle and adjust the "D" to meet the sub chamber needs that way. Rectangles and cubes are much easier to design & build.
What are the max "H", "W" & "D" dimensions you have to work with in the trunk? (Be sure to look at any mechanical and side panel restrictions and account for them) If you don't, it will come back to bite after the box is done and won't fit. (Want to avoid that pitfall at all costs)
Swez
Zach1989 on 07/8/2008 02:23:43
40 inches wide, 15 inches tall, 15 inches in length, but it has a 20 inch vertical slant at maybe 30 degrees or so thats what i need to go with the wedge. and the slant stops 7 inches before the trunk floor.
W= 40
L=15
H1=15
H2=7
and i forget the other measurement but i think its 10 or 12 if im not mistaking.
swez on 07/8/2008 04:25:46
OK, I ran some calcs and it looks like the "Depth" dimension would be good at 12.0". That leaves a net 2.222 cf internal, minus the divider board and subs. That's pretty darn close
The divider board displacement will be roughly 0.05 cf. Most 12's are about 0.1 cf displcement. (0.1 + 0.1 + 0.05) = 0.225 cf.
Consider these values:
W= 40"
H1=15"
H2=7"
D = 12"
Board thickness: 3/4" MDF
FYI: If you buy a full sheet of MDF, (4' x 8' x 0.75") from most lumber stores, (Lowes or Home Depot) they can cut the sheet into smaller panels which are easier to transport and work on at home. The last time I did this, cuts 1 & 2 were free. Additional cuts were 50 cents each, but he was slow that day and did not charge for any cuts. That made it real easy to cart home and fabricate to final cut dimensions.
Comments?
Swez
Zach1989 on 07/9/2008 14:22:53
Wow thanks a whole bunch Swez you have really helped me out a lot since i got all my new stuff i cant even say how much i appreciate it.
That sounds good as far as i know the home depot does do the first two cuts for free but im not sure i havent bought mdf or any plywood in a while.
thanks again but having 2.22 cuft -.225 should be right at or just under 1 cuft of room per chamber if that is correct i presume, right?
swez on 07/9/2008 18:53:32
Yes, 2.22-2.25 cf nets ~1.0 cf per chamber.
(+/- 5% is very acceptable)
You're most welcome Zach!
Swez
Zach1989 on 08/1/2008 02:27:12
Hey Swez Sorry I havent got back to you guys sooner. I had a question about the divider board. Would it be just the 3/4" MDF cut to fit just like it was one of the sides? And that is what will make up the .05 displacement?
If that sounds confusing let me know and I will try to explain further into details.
swez on 08/1/2008 04:10:15
If you make the side panels such that they are interior panels and are capped by top, bottom, front and rear panels, yes... all 3 panels would be identical. (side A, B and divider)
It's best to plan out a box design on graph paper. This has 1/4" squares on the entire page and you can scale the drawing to the planned dimensions and see if it comes out right on paper before firing up the saw.
Swez
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