dastt

iTrader: (1)

building a 4th order box for my buddies 15l7, i had someone help me with the specs and they told me to tune it too 60hz @ 80 inches port area. is this to high for strictly spl? i was thinking about bringing it lower to around 55. this is my first time working on a strictly spl box.

i was wondering what everyones SPL boxes are tuned to and what tone you guys play

and i know every box and sub is different. im just using this feedback as a starting point, im more than likely going to use a sweep from 40-55hertz to find where its max spl is but the problem in the only meter i can get near is going to be the one at the first DBdrag in FEB.

zinger002

iTrader: (1)

most of the hardcore setups that i have seen are 60 up to 72...
im sure someone will correct me and say they have never seen anything that high... but i have.

worldind

iTrader: (17)

What sort of vehicle will this be in? I'd say you're better off to start a little lower like you suggested... fourties and up until you don't gain anymore.

dastt

iTrader: (1)

this is going to be in a crew cab truck, the problem is that with 80 inches port area to get any lower than 55 is going to really long, probably too long.

dastt

iTrader: (1)

im designing this box so that the port is easily removed and replaced. the lowest port i can make is 48hertz. i think im going to make 2, one at 48 and one at 60 and see which ones better on the mic at DBdrag.

zinger002

iTrader: (1)

you will also have to play the right tone to go alog with it. grab a bunch of tones off realm of excursion and see which one is the loudest.

JordyO

iTrader: (17)

Tuning is based on the resonant frequency of your car.

Most North American cars are from 50-65hz.

My Mazda was 59hz... the Panda is 72.

dastt

iTrader: (1)

in that case i will go for the 60 and maybe the 48 will be low enough for some daily.

worldind

iTrader: (17)

I think you may get some unloading issues playing the sub daily tuned to 48hz...

dastt

iTrader: (1)

yeah but thats the lowest i can get it to go without the port being too long, i might see about getting to to around 40 by playing with the port area.