Help with a box

[blnk64 10+ year member]

I am new to car audio and recently invested in a set of rockford fosgate p3d212s and need a ported box. I know the cubic air space and tuning frequency need to match rockford specs, but is it ok to vary the depth or width of the box from the specs as long as frequency and cubic air space remain unchanged?

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[Kangaroux 5,000+ posts]

I am new to car audio and recently invested in a set of rockford fosgate p3d212s and need a ported box. I know the cubic air space and tuning frequency need to match rockford specs, but is it ok to vary the depth or width of the box from the specs as long as frequency and cubic air space remain unchanged?

you can tune to whatever you want it doesn't have to necessarily match up. i would suggest talking to someone like RAM if you want a design or pro-rabbit who will build you a ported box and send it to you

 

[Cruzer 10+ year member]

Internal Volume: 4.00 ft^3

Port Area: 60.937 in^2

Enclosure Tuning: 30 Hz

12" DUAL PORTED 4.0 ft^3

 

[Pataforce8 10+ year member]

Yeah. I would completely disregard the manufacturer's specs on box size. You can use some different programs to visualize what the sub will do (frequency response wise) in different boxes (sealed, ported, etc) of different sizes.

My guess is that that box is a compromise between sound quality and space. I would map the sub using WinISD and see if a larger box/different tuning would help.

 

[blnk64 10+ year member]

thanks for the input but i am not really sure what frequency or anything I would want for my subs. As this is my first system I was gonna stick with the specs until i learned more and could develop more of a preference. the problem is i can't find a 12 inch deep box (as rockford specs) for sale and think getting one built would be pushing my budget. i can find 15 inch deep boxes with the same airspace and tuning would that work for my subs?

 

[Cruzer 10+ year member]

link the box. but ur best bet is to custom build it or have someone build for you.

 

[blnk64 10+ year member]

TWO 12" inch DUAL VENTED PORTED WOOFER BOX - eBay (item 320535018675 end time Apr-13-11 12:51:21 PDT)

something like this was what i was looking at. like i said i want to spend enough to make it sound good but not go over board.

 

[blnk64 10+ year member]

12" inch DUAL SUBWOOFER SUB BOX ENCLOSURE Ported Vented - eBay (item 320674660037 end time Apr-20-11 12:30:24 PDT)

or this one. labyrinth venting

 

[Cruzer 10+ year member]

says its tuned to 38hz which is high for daily use. its fine, but its not targeted to sound good, its targeted to be the loudest for competitions. there are people that are ok with that tuning, but most like 30-34 for daily use

either will work, but dont get caught up on that "labyrinth venting" i dont think its anything special, someone will correct me if im wrong

 

[pro-rabbit 5,000+ posts]

prefab ported enclosures 9 times out of 10 are junk

 

[blnk64 10+ year member]

yeah i've been hearing that lower hz are more popular so i may look into that. so the lower hz will get me better sound quality? and i've heard people who are ok with prefab and people who aren't. how much would it cost to have somebody build a box? ballpark

 

[Cruzer 10+ year member]

rabbit pm him how much it would cost for u to build and ship one to him, maybe he can swing the price. worth a shot for both of you to benefit

 

[pro-rabbit 5,000+ posts]

PM me your zip and I can get you a ballpark figure so you have an idea what the difference is in price.

No my build quality is far superior to prefab(as would almost anyone who builds on here).

 

[Cruzer 10+ year member]

hopefully u can see this picture good enough, the orange is tuned to 30hz the grey is tuned to 38hz

u can see the orange is 3db louder on the low end, which is what most people love hearing, the low hard hitting notes

but u can see the grey will get 3db louder around 45-50hz area which will be overall loudest, but that peak will be noticeable. all the frequencies wont be equal loudness, with the 38hz tuning its going to be twice as loud around 50hz than any other frequency.

*note* just because its tuned that high doesnt mean it will sound terrible, it will be ok, just most dont use that unless they are going to competitions

 

[pro-rabbit 5,000+ posts]

The higher you tune the more "peaky" the sound will get with in a narrow bandwidth. This normally makes listen and adjusting the stereo for a decent sound in a daily application very hard.