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View Full Version : Competetion Box for my 2 12" RL-p (pic)



DrtySthV6SE
07-17-2005, 12:25 AM
hi guys, wanted to post these plans up mainly for yall to make sure my calculations were correct and of course to check my mad ACAD skillz :eyebrow:

Ive got 2 cubes for each sub, net volume, without any bracing i might add
box total dimensions are 36" wide, 23" deep, 13.75" high, with 3/4 MDF
port area of 12.25"high*3"wide=36.75"^2 for each port

port length of 14.8" , measured from the end of the piece that splits the ports to the ends of the port walls, Is that correct??

i get a tuning freq of ~50hz which is probably kinda high, i might end up tuning down between 40-45, which would mean i will lengthen my port and increase my gross volume a little, correct??

i am open for any suggestions to make this box better

thanks

http://bama.ua.edu/~booth020/subbox.JPG

DrtySthV6SE
07-17-2005, 02:09 PM
anybody got any input, are my calculations correct??

Buckshot
07-17-2005, 02:20 PM
2 Things that I see. What is the distance between the end of the "outer-port-walls" and the back wall? And, are you sure that center board is right?

DrtySthV6SE
07-17-2005, 02:56 PM
the length is 4.5 inches from the port walls to the back wall, i noticed the closeness also but i wasnt sure if it was ok, if i tune a little lower i dont think it would be a problem. What do you mean "is my center board right", i put is there to seperate the ports and block the air/waves form interacting between each sub, is there a problem with it. Are my calcs ok so far

saywhat?
07-17-2005, 03:08 PM
i think u should make 2 seperate ports. or one.....that goes straight back and T's on the back wall.

DBfan187
07-17-2005, 03:24 PM
for SPL purposes:

keep the port straight - no bends
get more port area.

DrtySthV6SE
07-17-2005, 03:28 PM
i do have two sepreate ports, my calculated length was not long enough to have it T off the back wall, if i had just one port for both subs there is a chance of cancellation, correct?? that is why i have two ports with the wall seperating them

let me change the dimensions and tune it a little lower and ill post another pic.

DrtySthV6SE
07-17-2005, 03:29 PM
for SPL purposes:

keep the port straight - no bends
get more port area.


so you are saying what i have is good to go for spl purposes

creater
07-17-2005, 03:39 PM
yea that looks alright by my view...his ports are straight...

saywhat?
07-17-2005, 03:43 PM
but that middle port better come flush with the fron baffle....

DrtySthV6SE
07-17-2005, 03:46 PM
i dont think it has too, just pretend like the part of the box between the end of the seperating wall and the front of the box is free air i.e. not part of the box, if i made it longer it would esentially lengthen my port,

thats the way i viewed it

davidfre21
07-17-2005, 03:56 PM
but that middle port better come flush with the fron baffle....
its louder the way he has it ;)

http://img272.imageshack.us/img272/9149/10015923io.jpg

davidfre21
07-17-2005, 03:59 PM
oh yea, what vehical?

davidfre21
07-17-2005, 04:03 PM
ahh a toyota, well only other thing i can think of is fire the port into the cabin. Even if it means having the port on the back of ur box

DrtySthV6SE
07-17-2005, 04:08 PM
thats what i am going to do , the box is going to be made backwards in my trunk facing the cabin, with the seats down the subs and port should fit right in the hole between my cabin and trunk, believe me i have thought this out :)

60ndown
07-17-2005, 04:09 PM
its louder the way he has it ;)

http://img272.imageshack.us/img272/9149/10015923io.jpg

2x 15" 'invisibles'?
where can i get some?
what are the ts paramiters of them?

davidfre21
07-17-2005, 04:11 PM
well then u seem pretty set, just get as much port area as possible, can u run the port on the bottom like i did?

davidfre21
07-17-2005, 04:21 PM
2x 15" 'invisibles'?
where can i get some?
what are the ts paramiters of them?
its the latest most newest **** yo...


but really they were in my garage

DrtySthV6SE
07-17-2005, 04:23 PM
no wouldnt fit the way i want it, i am making another box right now on ACAD for a lower tuning around 42-44, ill post it up when i get it done. thanks for you help man

DrtySthV6SE
07-17-2005, 04:26 PM
http://bama.ua.edu/~booth020/hole.JPG

see the box is being designed to fit the subs and port in this hole between my trunk and cabin

Moe Lester
07-17-2005, 04:46 PM
unless you can 100% seal it off, you might end up being louder firing it back @ the lisence plate

DrtySthV6SE
07-17-2005, 04:58 PM
i was hoping i could seal it off completely or get it **** close

DrtySthV6SE
07-17-2005, 05:27 PM
ok this is closer to the final cut. of course it looks pretty much the same but different dimensions, made the box longer and ports longer

net volume of 2.37 cubes, before any bracing or displacement, i doubled the front baffle though
port area of 36.75 ft^2, for each port
port length of 18.75 inches
my tuning calculations give me 41.977hz

could someone check my tuning calculations to see if im right

thanks guys youve helped alot

http://bama.ua.edu/~booth020/box2.JPG

Insomniac119
07-17-2005, 07:35 PM
Which direction to fire the port is it the loudest?

Mr. Opportunist
07-17-2005, 10:55 PM
i wish i could find a link for acad d/l i searched last night came up with nothing :( lol the box looks great.