11 cubic for 2 Q 18's. i want to retain the 33hz volume as much as possible but i absolutely want to reach 75hz at a very good volume out of these. my idea was to go 11 cubic and put a bit of poly fill inside.

 

it is not for certain that i will buy 2 Q's, i will know after i test my rebuild SP4 to see if i can get the volume i want out of it at the frequencies i want. im expecting i wont be able to.

 

this would be the box design: 

why are you buying Q's? explain your goals a bit better and we could probably figure out the best option for you 

Edited October 5, 201311 yr by lithium

u may be better off with just one ported in a really nice encloser

 

do what he ^ said first though, smarter people than i will chime in

lets start with my childish goals first. I would like to have a system that moves enough air to do hair tricks, can shake everything, and bassicly beat out the guy next door.

 

my real goals are to have a system that can play MUSIC at very loud volumes and retain its clarity. in previous posts i learned that my prefered bass range is in the 40-70hz range. I do not want to sacrafice the low end volume to obtain the high end and i want to have less peaks than my present sub. some peaks are going to happen and i understand that but i do not want to have 50db@33hz and 8db at 50hz. 

 

i have a ZX2500.1 so that is why i was thinking of going 2 Q's to obtain a wider and flatter response in sealed and more cone area to retain volume.

 

as for the volume i am looking for... i have 2 sets of alpine tweets right now and at max power they are not quite loud enough for what i am looking for. so i want this sub setup to be very loud.

 

 

edit: i will be putting my SP4 into a sealed box today, testing it in a new lower tuned box today, and testing it in a variety of higher tuned boxes. i may end up keeping it if i get what im looking for but if i dont i THINK the Q is my next step.

Edited October 5, 201311 yr by ncc74656

you're one sp4 should have done this ported.  why would you want to run sealed if you want lots of spl?

yo, how can i make a diagram of a box like that 

yo, how can i make a diagram of a box like that 

 

I use sketchup...google it.