posted
I am going to start construction of my abc box for my 12" Rockford DVC. I have a few quick questions before i start. Should this box be square/rectangular or should the woofer be on a slight slant? It will look better on a slant but that will be harder to design. Is pvc pipe ok for ports or should I get like aeroports or something? Will airoports reduce port noise? I have my dvc in the old box that my crank was in and I get a bunch of port noise. Any tips on the design and construction of this box would be appreciated.
------------------
Posts: 78 | From: Calgary, Alberta | Registered: Jun 1999
|
posted
You will need a router and a Skil Saw... Build it anyway that pleases you, square, slanted, or a triangle... It doesn't really make a real difference... You can use PVC ports if you please, just make sure to round the edges to prevent port noise... This is what I did with my ABC box and I get NO port noise at all... Your Big chamber should be about 2 cu/ft, the second should be 1 cu?ft... And three ports 3"x10" or 3"x8" for a bit more boom... These are not computer modeled but they should do OK, if you want better just let me know and I will run it for you...
------------------ Would you like fries with that???
Posts: 186 | From: Grande Prairie, Alberta, Canada | Registered: May 1999
|
posted
Ok, this is what Dukk told me and it worked for me... First calculate the largest box volume the sub will be effective in, then figure lenths for 2 ports in the box... Now divide the volume by three add the two port lenths together and divide that by three... This is it, too easy eh??? If you hate math go to www.mobiledynamics.com and download their newest box design sofware, I use it and have yet to be unhappy with what it spits out... I actually reccomend this program for a solid design program, its no term-pro but it still works pretty good... Any other questions???
------------------ Would you like fries with that???
Posts: 186 | From: Grande Prairie, Alberta, Canada | Registered: May 1999
|
posted
Hay johnwayne_401 Want to run it for the Vega 10" for me here is all the info and some from a past post of mine you may have seen it. Whould like to compare yours and what I figured I needed to do. For what I can tel I need to use the 3" ports at 17.75" in length. Here is what I planed on doing.... Here are the number that came with the subs. Box net = 1.6Ft^3 port = 4" @ 13.25"long Port displacment = .1Ft^3 Woofer Displacment = .07Ft^3
(Or two 3" ports at 17.75"long)
For main box I did this... Vbox= 1.6Ft^3 + .07Ft^3[diver] + .1Ft^3 [port] +.05Ft^3 [1/2port] to get 1.82Ft^3
Then for second 1/2 I did this... Vboxa = 1/2(1.6Ft^3) + .1Ft^3 [port] + .05Ft^3 [1/2port] to get .95Ft^3
That is how I under stood the first few post.
How about if I use the books paramitors for 3" port with two and only used the one 3" in the main box, one in the secondary box, and one in the divider. All ports as the book says are 17.75" long. Is that the figuring you ment?
Thank for all the help This prodject realy cought my eye.
Here is a bit mor info on the sub. Alot of progame I know ask for this... Fs 23Hz Qts .252 Qms 6.26 Qes .262 Vas 1.78Ft^3 Xmax 1.4" +-.7" Revc 3.2ohm diver dis. .07
posted
Well, the port freq. is a little high for my liking, but it should sound good IMO... I Don't know how I came up with adding and dividing but it worked out just fine for me... It was ported a bit higher I guess but it still hits hard at 30hertz... I went to the liberty of running this box through its paces and it performed well... Good luck man, I really hope you like this new box design...
------------------ Would you like fries with that???
Posts: 186 | From: Grande Prairie, Alberta, Canada | Registered: May 1999
|
posted
Hrm....I'll have to look tonight, but I thought I saw last year in one of Orion's publications that they had a similar box designed for their XTR2 8" SVC and DVC models that made the 8 sound like a decent 12. 2 chambers, .75/.25 = 1 cubic total. 11" ports around, 1 connects the two chambers, and then the other two are in their respective chambers.
Had toyed around with this concept for a rebirth of the BII, but me thinks that the Walmart Jensen amps (25x2) are worth more than my truck......*sigh*.....therefore I have held off. Hope it all works out for y'all, sounds like it will kick some serious butt!!
ub
------------------ "Captain Budget" Never tick off a klingon!
Posts: 7162 | From: No. VA | Registered: May 1999
|
Printer-friendly view of this topic