New box plan need some opinions

[Silver 10+ year member]

im building a new box for my lvl 4 15. i just want to know if i get this right. using 3/4mdf

here are my outer dimensions

H:18.75

W:30

D:20

(inner dimensions for port)

H:17.25

Port width: 2.75

L:35 (Physical Length is 31.5)

port area 47.44in2

port per cuft 13.67in2

gross volume:5.26cuft

net volume after displacement without port 3.47cuft

tuning freq 30hz.

what do you guys think??

my previous box some tart built was 3.3cuft gross and net 2.09 at 33hz. ugh got jipped 120$

Click to read more...

 

[RAM_Designs 5,000+ posts]

Looks like you're heading in the right direction. Might want to make it a tad bigger to use that 1000bd better and gain a little low-end.

 

[Silver 10+ year member]

i just built one that was 4.7cuft @ 44hz. that was bad lol. what should i aim for cuftwise??

ive just been expirmenting lately with boxes. only way i can learn how a sub acts in boxes lol.

 

[Silver 10+ year member]

Could I just shorten the port length a few inches, the tune may go up a 3/4 of a hz but my net vol went to about 3.7cuft shortening the length...

or should i lower the tune and make the box a lil bigger? what port area should i stay at i heard 13-16in is target

 

[Chriszle 10+ year member]

I would go with around 4-4.5 cu ft net. 64 sq in of port tuned to low 30s, if your looking for low end.

 

[Chriszle 10+ year member]

Make sure to brace it as well.

 

[Silver 10+ year member]

I got one //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

(outer dem)

H:18.75

W:35

D:20

(port inn dim)

H:17.25

W:3.25

L:43 (physical length 39in)

port area 56.06in2

port per foot 14.75in2

gross vol. 6.19cuft

net vol: 3.8cuft after displacement without port

freq 28hz

this on poss be better?? i listen to rap btw.. and that whomp whomp dubstep hehe!

 

[Silver 10+ year member]

yeah what should i use to brace it with? btw.... dc reccomends this woofer in a net vol 3.25cuft box. tuned LOW

 

[BlactimusCrime 10+ year member]

yeah what should i use to brace it with? btw.... dc reccomends this woofer in a net vol 3.25cuft box. tuned LOW

dowel rods or a windowed out piece of MDF like this:

 

[Chriszle 10+ year member]

Theres many types of bracing. you can used threaded steel rods, or you can use wooden dowels with 5x5 or so pieces of mdf screwed to each end for greater surface area. Window style bracing or w/e you want to call it is very nice too.

 

[Silver 10+ year member]

ok sounds good. one last question. should i mount the sub up or towards the liftgate? port will be on drivers side.

 

[2000TB]

you should do sub up port back