someone help!!

[germanyt]

alright, ive got the SXs installed and they are wonderful. just a few things need to be tweaked before it is done. if anyone read my last thread i had a problem with my amps, two nine.1s and an mtx 4 chan. the power lights were blinking. turned out that the circuit breaker between the batteries was tripped and the blinking was caused by the low voltage (5 volts) the amps were seeing. the problem now is figuring out what length my port needs to be. i have searched high and low on the internet and get different numbers on every site. i refuse to learn how to use winisd and cant download it on this computer anyway (government comp). during the install the port that i wanted was not easy to find so a 4 inch was used as a temporary. problem is it is tuned way too low. nobody laugh but its like 22 hz or something. sounds great and really hits the lows but not as loud as it can be by far. i would love if someone could tell me how long the port needs to be. im kinda hurting when it comes to the depth of the box so ill have to work with it. im thinking of bending the port if i have to but dont thing ive ever seen a round port with bends in it. the box is 7.5 cubes with two RE SX 15s. subs are fired to the rear and port is forward between the rear seats where the arm rest folds down. i have about 10 inches to work with before bending the port and im still not sure it will not hit the motors of the subs. box is about 17 inches deep from baffle to back. i could make it stick out of the box about 3 or 4 inches too so that can be figure in. i want to tune to 35 hz using anywhere from a 6 inch to 8 inch port. i used the port calculator on carstereo.com and it says an 8 inch port should be 8.89 inches long, which would be nice but i dont believe it can be that short. i used a formula i found and it came to 47.27 inches long which is impossible in my box so something is f**ked up. i guess a 6 inch is all ill be able to do. can anyone give me the length measurements? id really appreciate it. and what kind of spl diff will i notice by going from low 20s to 35 hz?

[Mangoamerican]

you can tune much better with a slot port

[ngsm13]

Indeed.

And NEVER port 180 degrees opposite of the subwoofer. Always on the same face or 90degrees off of the face...

nG

[ponchonutty]

Slot ports are all I ever do anymore especially for subs like SX that require large enclosures. I had one box that over half of it was a slot port that started inside the back wall and all around to the front where the subs were mounted.

[bjboertje]

how do you figure tuning with a slot port?

[germanyt]

i could do a 5 inch by 10 inch slot but i need the length measurements for it. the webpages i find all have different numbers. 35Hz in 7.5 cubes. can anyone help me out. i tried winisd again and i cant figure out how to work the damn program. i dont have all the t/s parameters on the sx to enter.