Fi.BL Goin Ported!! (Whoever Answers Best Gets Picked As Best Answer No Joke!)?

Question

Can You Guys Tell Me If This Enclosure Is Good For My 312'' Fi.BL's. Theres Only A Few Specs On This Enclosure So If You Guys Know How To Determine The Rest Just By Looking @ These Few Specs Please Tell Me If This Would Be A Good Enclosure, Because Its So Hard To Find Enclosures That Hold 3 12'' Subs (Ported!)

Sub Enclosure Specs Below!

Sonic Sub Box: 3SBVD12

Triple 12" Bottom Vented with Divider MDF Enclosure

Triple 12" Bottom Vented with Divider MDF Enclosure

Holds three 12" subwoofers

3/4 MDF (Medium Density Fiberboard) Construction

Durable black carpeting

Gold Terminals

Internal Box Volume: 4.9 cubic ft.

Dimensions: 20"D x 39"W x 15.75H

http://sonicelectronix.com/item_7852_Sonic+Sub+Box-+3SBVD12.html

Fi.BL 12'' Sub Specs Below!!!

https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=154828ab3765e32/shopdata/0015_BL/product_overview.shopscript

BL12

DUAL 1 | DUAL 2

Fs: 38.7 Hz | 37.8 Hz

Re: 0.75 Ohms/coil | 1.5 Ohms/coil

Qms: 05.79 | 5.93

Qes: .39 | .37

Qts: .37 | .34

Mms: 177g | 186g

Cms: 0.96mm/N | 0.96mm/N

Sd: 481cm^2 | 481cm^2

Vas: 30.9 l | 30.9 l

Spl: 88.0dB 1W/1m | 88.4dB 1W/1m

Bl: 12.8 N/A | 19.0 N/A

Xmax: 21mm

Rms: 1000W *

Sealed box: N/A cuft

Ported box: 1.8-2.5 cuft @ 30-37Hz

Sub OD: 12.500”

Cut ID: 11.125”

Mounting depth: 6.750”

Displacement: 0.15cuft

Answer 1

Well from the specs you gave it said that your ported box was 4.9 cubic feet but the recommended size for one sub was at the minimum 1.8. so for the smallest you would probably want for three subs would be 5.4 cubic feet. But honestly i am not sure how much of a difference half a cubic foot would make. If you can put the subs in the box, see how they sound, and go from there.

Answer 2

the specs for that box don't show the tuning freq. also, being ported, i would imaging the port opening would be on the inside, but from the angle of the pic you can see it. also, that 1/2 cu ft would make a difference of the tuning. usually prefab boxes are tuned high....50-60Hz range, which is not vary good at all. usually you want to stay around the 25-40Hz range. bottom line: i wouldn't go with it, you have nice subs, don't take a chance on a box. the box is what makes a good sub ;-)

if you handy enough, i would say to build your own. if your unsure about the dimensions adn tuning, let me know and i can design some box plans for you. if you'd rather just buy one, i could also just build you one, but the shipping may be kinda pricy. hit me up if your interested in my help.