View Full Version : Fi 15" Q Box *Pics*

02-13-2007, 05:37 PM
Does this all look correct for a 15" Q on ~1200w?

Can someone just look over everything and make sure it's all good? The port looks weird, since it's weird, but that's what RE said =\

The build will start soon, the sub will be here by the end of the week.



02-13-2007, 06:24 PM

02-13-2007, 07:38 PM
Well it looks like you followed the 12-16" of port area per cf, using 16 exactly actually. Looks pretty cool. what is it going in?

02-13-2007, 07:39 PM
What about bracing?

02-13-2007, 07:44 PM
Yall are loving some 12-16 sq. in. of port per cu. ft. lately. Id just not add the port length on. I wont even change tuning hardly I doubt. Im not a big fan of bracing myself, but if you feel like you should Id just put a piece behind the sub and hope it doesnt mess with the port.

02-13-2007, 07:47 PM
The box looks good.

The actual specs calculated with driver displacment of .19 cu/ft =
Net Volume: 3.77 cu/ft
Tuning Freq: 33.69 Hz

02-13-2007, 08:54 PM
That works out.

1.7hz higher, doesn't bother me, I am fine with that.

FAWK bracing.

Nah, Ill add a vertical piece of dowel. The port is bracing itself...so

02-13-2007, 09:43 PM
I was just told that this box is 4.4cu after port and sub disp tuned to 31hz

does anyone else know, because i am getting different answers.

02-14-2007, 04:48 PM
I'll repost this...

I will be running a 15" Fi Q on a 1200wrms in my trunk car, with sub facing UP and Port Backwards. I want 4.0 cubic feet after port and sub disp, tuned to 32hz w/ 65sq" of port.

I want the box to be 30" long and 14" high, my max width is 30" though.

Here is what I came up with so far, but I cannot figure out the second port length for the correct tuning.

External Dims: 24"w x 30"d x 14"h

Internal Dims (using .75" wood) : 22.5w x 28.5d x 12.5h

Internal Volume includ. port disp = 4.638

Port 1 = 5.25" w x 12.5" h x 24" d

Port 1 disp = 0.9

Port 2 = 5.25" w x 12.5" x

And that is where I got stuck.

I need the depth and height to be the same, but the width can be changed around.

02-14-2007, 04:55 PM
When you going to build this?

02-14-2007, 05:04 PM
I am picking up the Birch today or tomorrow.

Q comes in Friday.