2 15" lvl 4 dc sub box help

[ghost]

I too am req help with building a sub box for my tahoe. I found an old link online for very similar system. Ill post it when i can find it again. Anyways im thinking around 8ft^3 but need help with port size and everything... i want it to be snug in the back but not crazy tall! And be able to hide my battery back there as well... LMK what ya guys think!

Anyways, going off whatever you guys rec for sub and port direction. I want this to be loud but its going to be a daily too...

Heres the system

jvc double din
duralast gold under hood
kinetik hc2400 for the back
AudioQue 2200 amp
kicker 650x4 amp
2 dc lvl 4 15"s
all kicker components and Jl tweets.. (were allready in the truck)

 

[abladeafficionado]

I would do sub up port back with at least 100 in^2 of port.

I just modelled them up, and it looks like they need a bigger box. I modelled up DC's recommended 3.25 ft^3 per sub, and the response didn't look good at all. It wasn't until I modelled them in 5 ft^3 per sub that the response curve got flatter.

It seems like they need about 5 ft^3 per sub at about 32Hz to get a decent response curve. That size and frequency would give you a bump in the response curve from 35Hz to 50Hz (louder), and then mostly flat from 50Hz on up.

 

[NoPh33rRaCiNg]

I ran 2 15'' Lvl 4's in 8 cubes at 36hz with 112 sq inches of port. It is the perfect width and not too tall. It sits right at the top of the back panels. I have a pic and dimensions if you wanna run it haha makes it easy on ya...

 

[ghost]

lol thats awesome! that will work perfect. where did you put your battery, and how loud was it??

---------- Post added at 06:57 AM ---------- Previous post was at 06:54 AM ----------

I would do sub up port back with at least 100 in^2 of port.

I just modelled them up, and it looks like they need a bigger box. I modelled up DC's recommended 3.25 ft^3 per sub, and the response didn't look good at all. It wasn't until I modelled them in 5 ft^3 per sub that the response curve got flatter.

It seems like they need about 5 ft^3 per sub at about 32Hz to get a decent response curve. That size and frequency would give you a bump in the response curve from 35Hz to 50Hz (louder), and then mostly flat from 50Hz on up.

ok, so you are rec 10 cubes? what about port size?

 

[abladeafficionado]

When I modelled up the subs 10 ft^3 seemed to help. Louder and lower from the response curves, but I've never personally used the lvl 4 so I don't know how it responds to a larger box. You'll want at least 100 in^2 of port area, that blueprint looks to be a good start. I would tune it a bit lower personally, but I'm more into SQ/SQL than SPL. Ported to 36Hz would be louder than 32Hz, but wouldn't dig as low.

 

[ghost]

thanks guys.. im going to get started on it this weekend.. i think i might make the port just a little bit smaller.. how would i tune it to 34 hz? i still need to fig out where im going to put the battery

---------- Post added at 08:07 PM ---------- Previous post was at 08:00 PM ----------

also, i have barn doors so i was thinking maybe splittin the port into 2 ports and put them on the edge of the front instead of flat on the bottom of the front..

 

[abladeafficionado]

I would just do one port. It's just as easy and doesn't make much of a difference. Saves wood also.

http://www.the12volt.com/caraudio/boxcalcs.asp

Plug the box into there and it'll tell you the port length you need for that box and port area.

 

[NoPh33rRaCiNg]

lol thats awesome! that will work perfect. where did you put your battery, and how loud was it??

---------- Post added at 06:57 AM ---------- Previous post was at 06:54 AM ----------



ok, so you are rec 10 cubes? what about port size?

I had the batteries between the back of the box and the rear seats. Yea it was loud and sounded good. I had em on 3000 rms. That box tuned to 36hz had a pretty good range.

 

[ghost]

I had the batteries between the back of the box and the rear seats. Yea it was loud and sounded good. I had em on 3000 rms. That box tuned to 36hz had a pretty good range.

ok.. well ill only have about 2200 watts going to it.. so hope it bangs.. will it hit the lows that an L7 can. I sold my old set up to be louder! so i hope it is lol

---------- Post added at 05:09 AM ---------- Previous post was at 05:08 AM ----------

also in the dimensions how long is the port inside the box?

 

[NoPh33rRaCiNg]

ok.. well ill only have about 2200 watts going to it.. so hope it bangs.. will it hit the lows that an L7 can. I sold my old set up to be louder! so i hope it is lol

---------- Post added at 05:09 AM ---------- Previous post was at 05:08 AM ----------

also in the dimensions how long is the port inside the box?

Lemme look that up.