why do I peak so high?

[Wynndiesel]

I have 3 18's and 9k of power! my box is 15 cu ft after all displacements tuned between 27 and 28hz 12in of port per cu ft. my peak frequency is 43hz. why do I peak so high when I'm tuned so low?

the 28hz port is removable, when I take it out, my box is 15.5 cu ft tuned to 43hz 16in of port per cu ft. still peaks at 43hz but 1db quieter. shouldn't it be louder since its tuned higher and more port area???

I can get up to a 149.6 on a term-lab. should I be hitting better numbers with my setup? should I build a better box???? any tips on how I can build a better box? (enclosure volume, port area, tuning)

equipment is 3 dc xl 18's on a dc 9k, 2 330amp singer alts, 3 kinetik hc2400s, 2 hc3800s,with 6 runs of pos and 4 runs of neg 1/0 gauge

[splmark]

Do u have any specs on the box? .5 displacement for the port don't seem right in a box that big. Also what car

[Guest]

what kind of vehicle is this in? i presume an SUV?

[kirill007]

Try cutting the port down so it's tuned to 37hz and if you gain something cut it down even more.

You peak so high, because the resonant frequency fo your car is probably 43hertz or somewhere close to it.

[Decaf]

we need port area, not sqin/cuft to help

also, pics would help

Edited December 15, 2011 by Decaf

[Wynndiesel]

Try cutting the port down so it's tuned to 37hz and if you gain something cut it down even more.

You peak so high, because the resonant frequency fo your car is probably 43hertz or somewhere close to it.

why is my 43hz port 1db quieter? because it has more port area???

[Wynndiesel]

what kind of vehicle is this in? i presume an SUV?

01 Durango

[Wynndiesel]

Do u have any specs on the box? .5 displacement for the port don't seem right in a box that big. Also what car

28hz port is port up! when I remove it 43hz port is port back, 28hz port slips into the 43hz port, then L's out to top of box making it port up

[Wynndiesel]

we need port area, not sqin/cuft to help

also, pics would help

28hz port is 30in x 6.25 35in deep 43hz port is 31.5 x 7.75 11in deep

how do I load pics? I only know how to load YouTube vids

[Decaf]

if they are on ur comp, use full editor to the right of the post button and add them as an attachment