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View Full Version : help building a box for a treo ssx15

midwestcustoms3
06-17-2005, 07:01 PM
im looking to buiild a 3.5-4 cube box, would like to know how big of a port i should use and the length. i would like to tune it around 32-35 hz unless u guys have some better suggetions.

bigred78797
06-17-2005, 07:22 PM
im looking to buiild a 3.5-4 cube box, would like to know how big of a port i should use and the length. i would like to tune it around 32-35 hz unless u guys have some better suggetions.

IMO

a port with a cross area of 35 in^2 (3.5" x 10") and ~19.5 in long should do. Prolly could make the port a little smaller than that. That's with the box at 3.75 cubic feet.

Harrison486
06-17-2005, 07:25 PM
Ill design you a box for \$10

Moe Lester
06-17-2005, 07:25 PM
IMO

a port with a cross area of 35 in^2 (3.5" x 10") and ~19.5 in long should do. Prolly could make the port a little smaller than that. That's with the box at 3.75 cubic feet.

id go larger on the port than that, a slot port 15.5 high x 4 wide and 37" long would tune it to 32hz assuming you go with 3.75 cubes net.

midwestcustoms3
06-17-2005, 07:36 PM
let me ask u this? how do u calculate the tuning frequency of a box

also i dont know if this determines on how big the port should be but i am going to be competeing also as well as street beat, so is 62 sq. in. good still moe lester. what would the displacment be on this port around about.

bcarpenterfhl
06-17-2005, 08:02 PM
i believe 1/2 the SD of the sub is what competitors try to shoot for.

bcarpenterfhl
06-17-2005, 08:08 PM
for 4 cubes and 62 sq in. of port, the port would need to be 27.46 in. long for 35 Hz. that would displace about 1.12 cubic feet.

however, if you are competing, you will most likely tune higher in the 40+ Hz. area, depending on the resonant frequency of your car. i wouldnt jump into the competition thing to quickly, it seems like you have a lot to learn.

saywhat?
06-17-2005, 08:10 PM
hit me up man in a pm ill toy around with a program and see what i can do.

PM me with max demensions.

bcarpenterfhl
06-17-2005, 08:13 PM
hit me up man in a pm ill toy around with a program and see what i can do.

PM me with max demensions.

if toying around with a program means, plugging in a bunch of numbers into BBP6, its not gonna get you far. With a port of this magnitude, it will calculate the displacement way off, and could give you a substantially different volume and frequency.

Moe Lester
06-17-2005, 08:14 PM
nothin beats the good ol' pen and paper ;)

saywhat?
06-17-2005, 08:14 PM
id go larger on the port than that, a slot port 15.5 high x 4 wide and 37" long would tune it to 32hz assuming you go with 3.75 cubes net.

if u go 3.75 before any diplacement, the port wont fit with that much area tuned at 35 hz. does net mean after displacement?

Moe Lester
06-17-2005, 08:15 PM
i mean for a box that is 3.75 cubes after all displacements. It will need to be something around 5.5 cubes internally for the port and sub displacements. (im not sure what the treo displaces..)

saywhat?
06-17-2005, 08:15 PM
nothin beats the good ol' pen and paper ;)

if i knew the equations i would do the math, but ive sooo many different ones used....care to link to the CORRECT ones, and the order to use them?

saywhat?
06-17-2005, 08:18 PM
i mean for a box that is 3.75 cubes after all displacements. It will need to be something around 5.5 cubes internally for the port and sub displacements. (im not sure what the treo displaces..)

how much are u talkin before displacement,......maybe these programs arent all that great LOL

Moe Lester
06-17-2005, 08:19 PM
http://www.carstereo.com/help2/Articles.cfm?id=31

That will calculate port length correctly. Whenever I am designing a slot port i dont like to select the slot port option because it will factor in end correction. I would rather calculate the end correction manually, and in some RARE cases the port wont need end correction figured in.

Moe Lester
06-17-2005, 08:20 PM
how much are u talkin before displacement,......maybe these programs arent all that great LOL

5.5ish

saywhat?
06-17-2005, 08:26 PM
correcy me if im wrong but 18x35x14 INTERNAL is 4.744 cubes and a port with 16.5x3 inches as demensions= 49.5 sq inches of port. this would cause the port to be 16.21 at a tuning of 35.....being u dont use the side wall as a port wall???

saywhat?
06-17-2005, 08:27 PM
****, maybe i looked at it wrong, looks like i started with 5.4 cubes and net is 4.7....hmmmmm ****it

bcarpenterfhl
06-17-2005, 08:27 PM
5.5ish

with a port displacement around 1.12, i'd say closer to 5. but if this guys gonna compete, his port will be a lot shorter, and displace a lot less, so maybe even less.

saywhat?
06-17-2005, 08:29 PM
looks like the 15.5x4 is the best option with a grouse of 5.46

saywhat?
06-17-2005, 08:31 PM
i give up, i dont know what the driver needs for port area if hes comp. but what molester is sayin is correct from what i plugged in here.

bcarpenterfhl
06-17-2005, 08:31 PM
stop with the bbp6

saywhat?
06-17-2005, 08:33 PM
tell me where to get the equations, and what order to work them, and what to do with the answers and i will do the math. i like this math

Moe Lester
06-17-2005, 08:33 PM
with a port displacement around 1.12, i'd say closer to 5. but if this guys gonna compete, his port will be a lot shorter, and displace a lot less, so maybe even less.

i meant 5.5 internal for 4 cubes @ 32hz with a port 15.5 x 4

err maybe it was for 3.75 cubes, either way, everyones confusing everyone now lol

bcarpenterfhl
06-17-2005, 08:38 PM
what i often do is take the volume i'm shooting for, establish a port area, establish a tuning frequency, figure out how the port needs to be for the volume, port area, and frequency, calculate the port displacement, add the sub displacement to the port displacement, the add that to the volume i'm shooting for to get gross volume i'm going to need, and then figure out width, depth, and length of the box within the provided space restrictions.

saywhat?
06-17-2005, 08:41 PM
so figure a volume....do the port to that volume at the tuning u want, then just 1+1 them?

bcarpenterfhl
06-17-2005, 08:42 PM
ummm....i guess, if by 1+1 them you mean add.....

Moe Lester
06-17-2005, 09:07 PM
what i often do is take the volume i'm shooting for, establish a port area, establish a tuning frequency, figure out how the port needs to be for the volume, port area, and frequency, calculate the port displacement, add the sub displacement to the port displacement, the add that to the volume i'm shooting for to get gross volume i'm going to need, and then figure out width, depth, and length of the box within the provided space restrictions.

thats what I do, and i honestly dont really see any other way to come up with a box except for tons of trial and error... If you dont have the room then it can be another story though, youve gotta do what you can.

bcarpenterfhl
06-17-2005, 09:10 PM
thats what I do, and i honestly dont really see any other way to come up with a box except for tons of trial and error... If you dont have the room then it can be another story though, youve gotta do what you can.

well when i design i box for other people, they often have tight space restrictions. so i have try to get the optimal port area while trying to obtain a certain volume. so often, theres no escaping trial and error. but after doing so many designs, you kinda get a feel for whats gonna work and whats not, so usually i can get it right after 2-3 trials.

midwestcustoms3
06-17-2005, 09:50 PM
i dont do no major competing, just local db drag shows, not trying to go to finals or nothing. i just want it to be as loud as i can get it for street beat but on the other hand i also want to produce good number in the lanes. yes, i have alot to learn but where do u start with a bunch of questions and help. this would only be the second ported box i have built and the first was right off of dd's webpage. this box is going into a 05 accord and i know that dont help much cause at the moment i dont have measuremnts but i will get them. im thinking i could get a 5 cube box in there as long as i dont need to much hiegth .

saywhat?
06-17-2005, 10:00 PM
lol man, im from the south myself, born in mississippi, and just recently got back, but if ur anywhere near the accent i took u for on that last post.....ur the most bad *** person ever lol. that post made me laugh