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KARLEON
01-18-2004, 12:30 AM
Urgh, i have down countless and countless searches and i been reading this information and its just too complicated. I really want to have a custom box for my Magnums but all this math stuff thats needed to come up with an enclosure isn't there with me. I want to have atleast 2.0-2.5 cubic feet per driver. I want the box to be tuned to 32Hz with the vent inbetween the subs. I will be using 3/4 MDF wood if that matters any. I really need to know how big each sheet of wood should be. Examples, all the sides. the front, the bottom, the back and how long the and wide the vent should be to achieve the 32 hz. If someone has the spare time, i would very much appreciate the help and after all is said and done and i have a few dollars left over. I'll drop it to ya

KARLEON
01-18-2004, 12:44 AM
oh and i listen to mainly rap, so would 32hz be good enough to give me the ground shaking bass that i want or do i need 34hz or something? As i said, i have no clue on what i'm doing. So please help

Trixter
01-18-2004, 10:44 AM
What are the dimension you have to work with...the space in your car? Let me know and I'll help you out.

KARLEON
01-18-2004, 01:22 PM
What are the dimension you have to work with...the space in your car? Let me know and I'll help you out.

aww man, i really appreciate this Trixter. I was wondering if anyone would reply. But you just dont know how much this means.

Anywayz, my trunk is weird. When i pop the trunk its about 50inches in Width. Then it gets a lil bit smaller to about 41inches in width. Then it gets a lil bit more smaller. (But i didnt measure that part since thats where my amp is at) Then i measured the Length (how far is goes back) and it was about 25 inches. And if its possible, i would like for my box to be no more than 17 1/2 inches in height.

Right now i have some pre-fab box and i have it standing up so the subs are firing at my back dash, and it stands up at about 17 1/2 and its just about perfect.

All these are my max dimensions, so if you can try to have the box a bit more smaller. I just want to make sure it will fit nicely. Maybe back off an inch or 2 and it should be perfect.

Oh, and i dont know if this would help or not, but my trunk clearance is about 38-39inches in width

Again, thanks for the help

KARLEON
01-18-2004, 01:24 PM
Oh, and what tuning frequency do you think would make my magnums pound like a mofo yet still have the SQ to hit every note of bass. What ever it is, Thats what i would like

Trixter
01-18-2004, 06:17 PM
Do you know the sub's displacement? Right now I'm thinking something like 30l x 16h x 24d. As far as tuning I would guess something like 32-34. Not that familiar with the D2's so you may want to talk to someone and find out a good freq. and then we can go from there.

KARLEON
01-18-2004, 10:02 PM
Stereo Integritys says 6.75inches mounting depth. And i guess 32hz frequency is fine. I just started a thread to see what others think, but i will probably just go with 32hz

Trixter
01-19-2004, 09:28 AM
We need to know how much volume the driver displaces. (Probably somewhere around .15cu' per driver)

Trixter
01-19-2004, 10:36 AM
Ok...here's what I came up with...

box
Front: 14.5 x 14.75 (2x)
Back: 14.5 x 32 (1x)
Top/Bottom: 24 x 32 (2x)
sides: 14.5 x 22.5 (2x)

port (tuned to 34Hz)
14.5 x 12 (2x)

outter dimensions are 32L x 16H x 24D (Inner dimensions: 30.5 x 14.5 x 22.5)
30.5 x 14.5 x 22.5 / 1728 = 5.76cu' (vol. before any displacement.)

vent: 14.5H x 2.5W x 12L
14.5 x (2.5 + 1.5) x (12 - .75) = .38cu' (port displacement)

driver displacement: .25 (for both)

total displacement: .25 + .38 = .63

5.76 - .63 = 5.13cu' (internal vol.)

KARLEON
01-19-2004, 11:16 AM
Awww, you are the man trixter. Thanks for the help. I'm no way mathematical inclined, so those numbers were a b*tch. I have one question though. Whats the difference between a normal vent which just goes back a certain length. and the one they showed on edesign website.

http://www.edesignaudio.com/im2/boxcuts/12%20rec%20vented.jpg

I hope you get what im trying to say

DBfan187
01-19-2004, 02:22 PM
Trixter's design wil work great! 34Hz is perfect, you should get great SQL from that design!

KARLEON
01-19-2004, 02:33 PM
Trixter's design wil work great! 34Hz is perfect, you should get great SQL from that design!

Thanks, and thanks again to Trixter

Trixter
01-19-2004, 07:09 PM
The only difference is that the port is on the side. The reason it's zig zaged like that is because that port is really long. That would be like if you needed a port that was 50" long and your box is only 22" deep. Just another way to get the length.

Your welcome for the box. If we ever hook up, you owe me a beer. :D

dbhittin
01-19-2004, 07:43 PM
looks good, i just made up some plans last night for someone off here, but forgot who

KARLEON
01-19-2004, 09:14 PM
i'll give ya 2 beers

KARLEON
01-20-2004, 04:23 PM
would i mess things up horribly if i take off an inch on the length or width? ANYONE feel free to respond. Just want to make sure i have enough clearance. It should be fine, but i just want to take extra precautions. Oh and what do you guys do to brace the hell out of a box?

Trixter
01-20-2004, 08:12 PM
You have to be so difficult! lol

You will be fine. Just add another inch to the length of the port; making it 13" long. As for bracing, get a few lengths of 1" dowl. Use pieces to go across the box inside. A few spots to go would be between the port and the sub to the back of the box (you could do each side), one in the center of an end going to the side of the port (and the same with the other side). The port pretty much takes care of the top and bottom. The dowl won't take up a lot of room and is round so it won't cause any standing waves. Threaded rod can also be used with washers and nuts on the outside of the box. But if your tight on room (on the outside), the nuts may get in your way. (Pluse you can't see anything of the dowl.)