Inputs if this box im designing will work....

[islandpride684]

The box is for 2 Obsidian's 15V3D4s. Below are the specs for the V2s, I emailed them for the V3 specs but they haven't replied back so I just used the V2s specs. Hopefully it'll work.

Obsidian 15" v2 D2
Re: 4.0 Ohm
Fs: 31 Hz
Qms: 2.9
Qes: 0.76
Qts: 0.61
Vas: 81
Le: 4.36 mH
BL: 18.18
SPL: 87 dB
Sd: 856 cm^2
Mms: 321 g
Xmax: 20mm
Peak-to-peak: 62mm (2.45")
Power Handling: 600 watts RMS

Recommended enclosure info:
Sealed ~ 2.0 to 2.5 ft^3
Ported ~ 2.5 to 3.75 ft^3 @ 30 to 32 Hz
Cutout: 14.0"
OD: 15.5"
Mounting depth: 8"
Mounting flange to top of surround: 1.5"
Displacement: 0.19 ft^3

Here is the pic of the box design

free upload image

H=18.75 L=40 W=22

Port Length=17 H=16.5 W=3.5

Tuned to 31 Hz with a port area of 58

Any inputs will be much appreciated. Thanks!!!!!

[Aj11]

right off the Bat that's not enough Port for 2 15s. it's prefect for one 15 but not 2.

for example a 15 sub usually likes 40-56 inches of port. so 4 4inch aero ports, 2 6s,or 1 8aero. the single 8 is what I'm running. but i haven't ran your measurements to see the size of the box yet. hold on.

7.2 cubes is a good size for 2 15s imo. i like big boxes. but i don't know your subs that well. I'm sure someone else will chime in and give a Lil more info on those subs.

[islandpride684]

Appreciate the reply bro, based on their website, 1 15 should be mated up to the equivalent of a single 6" round port which equals to 28.3 sq in. And it says do not exceed 30% of the surface area of the driver for the port. So I figured 58 sq in should be good for the 2 15s.

[Jessica]

30% of surface area would be 106sq inches

[islandpride684]

Let's say a surface area of 1 15 is 176. 30% of the sub's surface area is 52.8. Two subs will put that at 106 sq in. Just as long as my port area does not go past that I will be good?

[slowfkncar]

Like AJ said,moar port! you are gonna have an incredibly flat and low output with crazy cone noise with 8 sq inches of port per cube. 80-105 sq. Inches of port will do or 14sq.inches per cube. Your choice.

[islandpride684]

Roger that, back to the drawing board...thanks y'all

[Joe X]

Roger that, back to the drawing board...thanks y'all

You should tell what vehicle is it and what amp you are using.

[islandpride684]

My man Joe X, I was hoping you would chime in...it's gonna go in a 2007 yukon. Running of a rf 1500bd

[Cj Kumz]

What are you max dimensions and how much power are you gonna be running??