4th order design

[nicholasmccabe]

Can anyone help me. I am trying to get a new setup for 2 sundown sa 15s d4. I wanna do a 4th order bandpass blowthrough my rear armrest in a 1997 cadillac seville. I have a nice size trunk but the box will have to be built in sections because the opening isnt that big.
Roughly 7 or 8 cubes to work with. PLEASE HELP!!!!!!

[nicholasmccabe]

Meaning, when the trunk lid is up, theres only so much space to slide a box in. I had a single 15 in a ported box, it was 3.5 cubic feet. It barely slid into the opening. which isa why the 4th order will have to be buld and installed in sections.

[wenn_du_weinst]

a 4th order for 2 15's isn't going to fit in 8ft.
you could try 4ft ported and 2ft sealed each but I doubt it will be very loud.

[nicholasmccabe]

if we maximize space i can do 10 or 11 cubes. I dont care to have any room left after this goes in. Just room for amps, i have no extra batteries and such

[Flastrongman]

I can design one for you for a small fee. And it can get very loud in that space

[Jroo]

The best 4th order I ever heard was in the trunk of a deville. He had 4 10" round solobarics. The box took a majority of his truck and ported directly through the ski hole. It pounded so hard but had zero trunk rattle at all. The car had a ton of deadning and when you opened the doors, bass literally rolled out from nowhere. Everyone that heard that car said ****, but the car played music just as well as it pounded.

[CAT MAN]

The best 4th order I ever heard was in the trunk of a deville. He had 4 10" round solobarics. The box took a majority of his truck and ported directly through the ski hole. It pounded so hard but had zero trunk rattle at all. The car had a ton of deadning and when you opened the doors, bass literally rolled out from nowhere. Everyone that heard that car said ****, but the car played music just as well as it pounded.

mm skihole 4th orders.

[nicholasmccabe]

Exactly what i was thinking!!! Why wouldnt it be the best way to go!! all output goes directly into the cabin!! I give 2 ***** about hjaving any room left in the trunk. Im just not being reassured that the a pair of SA 15s will be ok in a 3 or 3.5 sealed section , firing into a 6 or 6.5 ported section tuned to aroung 42 or 45 hz. I had a series tuned 6th order and i dont think it was pinpoint accurate, so i had it roughly a week before i blew my Rockford T2 15". It was fine when it was in a ported box, but as soon as it went into the 6th, it started sounding like ****. Not to mention the 6th sounded like **** on music. I need to know that if I do the 4th order, that it will play rap music and also kill the lows for some bass mechanic and some chopped and screwed music. I like alot of lil wayne

[nicholasmccabe]

Has anyone heard of this 80inches designing 4th orders?? Will 3 cf sealed and 6 ported not be enough for the 2 SA15s?? I have a 10x10 area for the port to button up to on the backseat.

[nicholasmccabe]

anyone?? Heres what i got so far. I will be doing 2-SA15s D4, wired to 1 ohm on a Rockford Fosgate PowerBD1500.1. The 4th order i have sketched out will be built in 2 sections.

Sealed Section:Gross
34" Wide
15.5 "Deep
17" Tall
Ported Section:Gross
34" Wide
28" Deep
17" Tall

I will have to put the ported section in first and then slide the sealed section, have some type of connecting pieces drilled onto the top of the boxes, and some seals to make the connection airtight.

I will be using a 1.75:1, ported to sealed. I will be porting through the rear armrest, Looking at around 50 inches of port area. Im thinkin it will be 15" Tall, about 6" wide, and 6 inches long?? HOw will that be!!!! Efffing bangin Son. Thats whats up!! Tune that beaaatch at around 42 , its going in my cadillac, Decaf FTMFW!!!!

[galacticmonkey]

Just do 2 cubes sealed per sub and then use whatever other space you have as ported. Even if it ends only being 4 cubes ported plus port, you would still be good.

[nicholasmccabe]

ok. Gmonkey, will you help me with the port?? Like I said , the hole i have trimmed out behind the rear armrest is about 12" tall and 6 1\2 wide. How long shall i make the port for a tuning of 42 or 44 hz?? I wanna do music and have decent numbers for next season < and dont forgtet i wanna do hairttricks from the trunk.. With out all the bull shat taking out the back seats, cutting the rear deck out, all that rubbish. I wanna clean install, and be able to do black girl hair tricks. As my wife is black

[nicholasmccabe]

anyone

[JeepGuy]

There is a calculator for port length in the12volt.com and a few other sites but I'm on my phone right now otherwise I would tell you the exact length.

[galacticmonkey]

You would need to know the size of the ported chamber and amount of port area to find the tuning.