4th order for 2 SA 12's design help

[mca2012 10+ year member]

im looking to make a 4th order for my 2 sundown SA 12's and put it in my trunk of my honda accord. i wanna have it so i use up most to all of the trunk. if any one has done a design for 2 of these can you post the measurements of the box internal and external. my max dimensions to work with are (33 1/2 D x 36 W x 17 H) also can you post the port length and dimensions because im going for a 50hz tuning so my low end is arounf 20hz -30hz but i can still hit those mid-lows like the 45hz to 80hz. i really need help this is my first box build ever and i wanna make sure its done correctly. im powering these beasts with a hifonics bxi 2061d amp pushing 2400 watts rms at 1 ohm.

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[mca2012 10+ year member]

the specs of the sundowns are

re:4.57 ohms

fs: 33.71hz

VAS: 21.21 liters

Qes: 0.58

Qms: 5.34

Qts: .52

Le: 3.40 mh

BL: 21.64 NA

Mms : 280g

Sens: 83.21 decibals

 

[Flastrongman 10+ year member]

why not buy a good design? There's lots of designer's on here that will do a design for a very reasonable price.

 

[Kangaroux 5,000+ posts]

do seperate sealed chambers @ 1 cube each and stuff 1lb of polyfill in each chamber. On the ported side go with 4 cf, and tune it to 48-50hz. To get reall ******, go 6cf on the ported side, if you have room. That will be even more efficent and get as loud as you can stand it. I can work something ouit for you, as far as a design. Send me a pm my guy

Nick

Why would you use poly fill on the sealed side when you can make it as big as you want and not need poly fill?