Box design ported for 4 8" REx subs..

[rsxs1212 10+ year member]

I want the box to be about 40x14x14 or something like that to be right around 4 cubes.. Ive built some sealed boxes but this will be my first ported.. Ive had ported ones built for me but im ready to give it a shot. I looked at t line boxes but they seem a bit complex.. So the question comes about of aero port or do a slot port.. Id like it to be tuned to about 33hz if that is possible... The port tuning is what I dont quite understand and how to find port length.. I found a nice calculator for it but just would like to get some advice from the pros..

Thanks in advance for the help.. I had audioque 15" hdc3's but was too much and took up way to much space for me so I thought this would be a cool project and im going to rhinoline the whole back of my truck as well as the exterior of the box.. All this is going in a nissan xterra just for everyones knowledge.. I like listening to rap and then rock some of the time too.. I used to just be into sealed boxes but when ported boxes are constructed right I think they sound just as good

Thanks for the help

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[iamamp3pimp 5,000+ posts]

Youre in bradenton. Idk if you have the tools or not, but if youre looking for a hand, you should swing by the build-spot.

shoot me a PM, i am in Hudson.

-Robin

 

[rsxs1212 10+ year member]

I have basic router, table saw, tape measure and things of that nature. I should be fine as I have built sealed boxes I just dont know what to do as far as dimensions

 

[rosshimself13 10+ year member]

if you have win isd, a calculator, and sketchup i would suggest you read this right here and call it a day, its really simple, and all you need really is the displacement of your sub

Edit: you dont even need sketchup, but it will allow you to accurately draw your box to give you an idea of what it will look like

 

[DonH 5,000+ posts]

way to large for 4 8's dude. i have a 4 8" box i would sell for 80+shipping but measurements are 49" x 12.5" x 12" with interchangeable round ports....double baffle with black carpet, red paint where the woofer mount. lmk

 

[RAM_Designs 5,000+ posts]

40x14x14 gives you 3.48^3 before any displacement. Assuming .6ft^3 for a normal slot port and .4ft^3 for subs and you're in a good area(around 2.5ft^3) for 4 RE8's.

 

[on1wheel01 10+ year member]

4 cubes is way to much for 4 8's. I just built a box for 3 e8's 40"w 12"h 14"d 2.2 cubes tuned to 32. I suggest doing similar to that a little wider for port and subs back or up, or you can do subs up or back and port to side.

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[rsxs1212 10+ year member]

well like mryan423 said after displacement it comes down. Im just looking at overall box volume without factoring in the ports and all.. dman1 I would do the box but theres no way i can fit 49 inches in my car.. onwheel01 i like ur box design i just need one more 8" sub in there maybe a few words of wisdom to help me out.. I just want to make sure i do this right because i know the box can make or break the subs performance

 

[rsxs1212 10+ year member]

and i dont have win isd or know what that is, I have a mac and if that is operable perhaps i can mess around with it some

 

[on1wheel01 10+ year member]

well whats the total width u have to work with 8x4 is 32 then take in 1" apart from each other or so. You could do subs back or up and port to the side.

 

[RAM_Designs 5,000+ posts]

Also, with a 14" tall box he can offset them so that they won't take up as much space...I did this with some older RE8's just to make it look different.

 

[rsxs1212 10+ year member]

I have 42" of width to work with.. amazing how much smaller my cargo area is in it compared to the explorer I had... also amazing how I have no repair bills on this and the repair bills on the paid off explorer were more then payment on the xterra !! LOL

anyway I think I can fit the subs comfortably next to each other without much problem but Maybe not..

 

[on1wheel01 10+ year member]

OK how bout this 42" wide 14" deep 14" high port out the side 3.5" wide port. Gives u 2.5 cubes tuned to 30.7, 43.75 inches of port. Should be pretty loud. That way u can fit the subs side by side with no probs and give about 1.5-2" between subs.

 

[rosshimself13 10+ year member]

14x14x42 outside, 2.19 cu ft 12.5x3x38.5in long port tuned to 32hz, subs forward or top, port side, guessing they displace.4 total on subs, rough design, im a newb but i think this is about right... it might not be perfect, check my math

edit:if you only have 42'' this wont work, you need room for the port to fire took about 20 minutes to figure all the math, and shit out while drawing it

 

[rsxs1212 10+ year member]

That mock-up that rosshimself13 did looks pretty dang good to me.. easy to make too.. I think I will probably just end up going with that unless anyone sees any problems with those plans..