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View Full Version : What am I doing wrong, 4th order for 2 15" ti



husker77
04-18-2012, 10:14 PM
I am trying to design a box to install my pair of 15" eclipse ti in my truck. It is a an old ford f100 regular cab. I was leaning towards a pass thru and after some research I was thinking a 4th order would take the smallest amount of cutting. I am using winisd and must being doing something really wrong.

Here are some screen shots of what I got.

2653200526532004

Going by the winisd diagram the box can be w=48 d=16 and h whatever it needs be. Also I get a Qes/pe! in the vent mach which I assume is bad.

Here is the best I can find for specifications of my subs

Re = 6.3646 ohms
Fs = 34.9878 Hz
Zmax = 92.7325 ohms
Qes = 0.6472
Qms = 8.7827
Qts = 0.6028
Le = 6.0781 mH (at 1 kHz)
Diam = 317.5000 mm ( 12.5000 in )
Sd = .0792m^2(122.7185 in^2)
Vas = 53.5213 L ( 1.8901 ft^3)
BL = 27.2810 N/A
Mms = 344.2702 g
Cms = 60.1046 uM/N
Kms = 16637.6641 N/M
Rms = 8.6172 R mechanical
Efficiency = 0.3328 %
Sensitivity= 87.2398 dB @1W/1m

I listen to all types of music, metal and rap mostly, not to worried about it metering great. I don't know if I tuned it to the right freq. Also if you would recommend something different let me know.

husker77
04-18-2012, 10:24 PM
http://img69.imageshack.us/img69/4816/4thorderbox1.jpg (http://imageshack.us/photo/my-images/69/4thorderbox1.jpg/)

---------- Post added at 07:24 PM ---------- Previous post was at 07:23 PM ----------

http://img694.imageshack.us/img694/3270/4thorderbox.jpg (http://imageshack.us/photo/my-images/694/4thorderbox.jpg/)

galacticmonkey
04-18-2012, 10:26 PM
What kind of sound are you looking for? If you build it where it's at 2 sealed, 3 ported with right around 50in^ of port tuned around 45hz, it should have good output and a nice range.

galacticmonkey
04-18-2012, 10:33 PM
Oh, of it's for 2 subs, just double the airspace and bring the port to around 80in^.

husker77
04-18-2012, 10:34 PM
What kind of sound are you looking for?

I like to listen to all types of music, mostly metal and rap. I want it to sound good, but be loud(don't we all), I would give up volume for sq. It doesn't matter if it meters good, but I spent a lot of money on this stuff so I don't want it to be embarrassed when I go to local comps.


If you build it where it's at 2 sealed, 3 ported with right around 50in^ of port tuned around 45hz,

I don't know what that means. I have forgotten most of what I knew, and I didn't know that much. It's mostly the lingo I haven't picked up on yet.


Oh, of it's for 2 subs, just double the airspace and bring the port to around 80in^.

Sorry I wasn't real clear about that, edited op to make it clear what I had.

husker77
04-19-2012, 06:58 AM
What kind of sound are you looking for? If you build it where it's at 2 sealed, 3 ported with right around 50in^ of port tuned around 45hz, it should have good output and a nice range.

So with doubling for 2 subs are you saying 4 cubic feet for the sealed portion and 6 cubic feet for the ported portion? And 50 square inches of port, so around a 7" x 7" square port. How long?

Would a different style shape of port be better?

Thanks for the help, I do appreciate it.

brynm
04-19-2012, 07:08 AM
So with doubling for 2 subs are you saying 4 cubic feet for the sealed portion and 6 cubic feet for the ported portion? And 80 square inches of port, so around a 7" x 7" square port. How long?

Would a different style shape of port be better?

Thanks for the help, I do appreciate it.

Fixed for you.

galacticmonkey
04-19-2012, 01:23 PM
I'd do it with a subwoofer on each side, in it's own sealed chamber, with the ported section in the middle. I'd start with the port being 9x9, with it being whatever length needed for a 45hz tune, then start shrinking it until you're happy with the low end output.

husker77
04-19-2012, 03:24 PM
How do I figure where to start with port length? By shrinking you mean length?

At one time I thought I knew what I was doing. I should just pay someone to design my box, but I like learning.

DaveVT
04-19-2012, 03:34 PM
PM this guy he does great work if you decide to have him build for you and he also does box designs so he can answer all your questions

Moble Enclosurs