Need advice on aq2.5-15" ported box

[9erHomer]

Hello everyone!!! This is my first post on the SMD forum. I just purchased an aq sd. 2.5 15" sub D4 ohm and a aq 1200d that i'm going to be running at 2 ohms. My space limits are

-35" wide

-16" height

-15" deep

I used the 12volt site to help me figure out that aq seems to use 41hz to tune their boxes. I came up with the following box.

34" w, 16" h, 15" deep. this gives me an internal vol of 3.68ft^3 I estimated about .17 woofer displacement so an internal vol of 3.51 ft^3. I was thinking of a 6" aeroport so using the12volt site i calculated a 6" aero port at 8.5" long which puts me at 41hz.

What do you guys think? any input would be appreciated. Thanks guys

[Joe X]

Welcome, post the vehicle this box is going into.

[9erHomer]

It is going into a corolla. I was thinking of facing the sub and port forward and have the seats folded down while playing

[Joe X]

Port/sub front should be fine, 41Hz tuning not very good for rap and such, also these subs like big boxes. This is what I would do for that sub:

Enclosure Specifications:

Fb = 35 Hz

Vb = 4 ft^3

External Height = 16 in

External Width = 35 in

External Depth = 20 in

Port Width = 4 in

Cut Sheet List:

* All Dimensions in Inches.

* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

Front = 30 1/4 x 14 1/2

Back = 35 x 14 1/2

Left & Right Sides:

Side 1 = 18 1/2 x 14 1/2

Side 2 = 19 1/4 x 14 1/2

Top & Bottom = 35 x 20

L Port Internal Assembly Parts:

Front to Back = 14 1/2 x 14 1/2

Extension = 3 x 14 1/2

As an alternative to online calculators I would recommend playing with Torres calculator downloadable from this site.

[9erHomer]

Thanks Joe X, so I did the math wrong? I tried to figure out what the aq site recommends on their tuning and I kept getting 41hz? Well I listen to rap for the most part. I wanted to keep the depth to 15 so I could have room in my trunk. I'll download Torres tonight and ill give it a shot with a width of 35" and 15" depth. I'll c if I could figure it out? I'll let u know how it goes tomo. Thanks again!!! Man, I got a lot to learn

[Joe X]

Your math seems ok now that I checked it, I recommend Torres since it's easier and faster to work with, if you want to try a tighter high tuned spec there is nothing wrong with that, but if after building it you find that deeper bass plays light then a spec like the above will perform better on the lows.

[jeep0312]

No offense to anyone but in my experience 4 cubes is too big for a 2.5 15''. My sub likes to bottom out easily in 4.0 cubes. I recommend 3.0 cubes tuned to high 30's

[9erHomer]

So do u think that 3.5ft^3 is too big, Or should I stick to 3.0ft^3? What bout 38hz is that good. I def want to be able to hit the lows? One more Q, why does aq tune their boxes high?

[9erHomer]

Hey Jeep0312, do u think that ur bottoming out ur sub due to too much power? I'm going to be using approx. 870@ 2 ohms.

[9erHomer]

Hey Joe, i tried to go onto Torres and I couldn't figure out if I was using the syst properly. How did u give me a detailed cut list? This is my specs for my new 3.0ft^3 box for my aq 2.5-15. Is it possible to give me a detailed cut list Again? Thanks for helping me out!!!

16-h

35-w

15-d

Port 14.5h x 2.75w x 17L @ 37.78 hz

Port area per foot= 12.50in^2

Net volume 3.19 ft3