View Full Version : Box Design, gimme the pro's and cons

07-07-2009, 07:03 PM
Back Ground: I want to have a functional third row.

Sub -- Diamond D312D4
Amp -- Alpine M350 -- 350rms @ 2ohms

I was going to build a slot ported box but I would rather build a box using 2-4" or 3" round ports firing up with the sub downfiring. Diamond recomends the slot port but would this work. I know that I would need to router the top of the ports.
Gross cubic feet -- 2.26.
Length of single 4" would be 9.30" for 35 hz. Can I split this in 2 for 2 - 4" ports at 4.65 inches each or run one single 4 inch order at 9.3"?


Any feedback is appreciated.

07-07-2009, 07:20 PM
whats it going in

07-07-2009, 07:30 PM
Ford Expedition. I am only running 1 sub in the immediate until I can decide where I would mount a larger amp, I want the sub amp out of site, and which 2 subs to run. I got a good deal on the D3 so I bought it in hopes to upgrade down the road.


07-07-2009, 07:33 PM
what do you mean out of sight? like under the seats? are you looking for an sq setup or spl setup

07-07-2009, 07:45 PM
Well, best of both worlds I guess. It is kind of hard for me to choose. I want to listen to whatever music I like and have it sound good. Get loud when it needs to, I guess I'm vague. Here is what I have installed:

Kenwood Exceleron HU

RE 6.5 components -- Front
Cliff Designs 6.5 components -- Rear (I know not the greatest)
Alpine MRV-F353 - 40 x4 rms @ 4

Diamond D3 12 - D4
Alpine MRP-M350 - [email protected] ohm

Big 3
16 g monster spkr cable throughout
4 gauge power and ground.


07-07-2009, 07:49 PM
Ohh sorry, with out of site, what I have done is cut a piece of mdf to fit in the stock sub/amp location behind the trim panel. This is where I am mounting the cap (I know) and amp. The M350 is rather small but enough for the D3. If I uprade to the subs I really want, I'll need 800-1000 rms, which is a larger foot print amp.

I'm really not sure why i included, I guess I figured the more information I could give the better?

07-07-2009, 07:53 PM
this was a down facing i did 4 a 2007 expidition (top is off ) it was for two flat piston subs and was only 1.65 ft^3 you could do some thing like that and still have a bit of cargo space (stealthy )http://i668.photobucket.com/albums/vv50/DAPPA5/IMG00060.jpg
or you could go all out http://cgi.ebay.com/EXPEDITION-NAVIGATOR-10%22-PORTED-SUBWOOFER-SPEAKER-BOX_W0QQitemZ350220747509QQcmdZViewItemQQimsxZ2009 0706?IMSfp=TL090706113010r14187#ebayphotohosting (http://cgi.ebay.com/EXPEDITION-NAVIGATOR-10%22-PORTED-SUBWOOFER-SPEAKER-BOX_W0QQitemZ350220747509QQcmdZViewItemQQimsxZ2009 0706?IMSfp=TL090706113010r14187#ebayphotohosting)

07-07-2009, 07:56 PM
So this box was sealed or ported? I am assuming sealed. For the present, I have built a downfriing sealed 1 ft^3 box but would really rather have a ported box. I have looked at that box on ebay over and over. I would have done something like that if I had 2 subs. It seemed like a waste to buy now and have one side empty. I have been seraching for a box similiar with 2 ft^3 for a single 12. Everything I have found is either ridiculiously priced or a cube that wouldn't work.


07-07-2009, 08:02 PM
you could easily do some thing ported
pm me with your dims and specs i'll draw you something

07-07-2009, 08:14 PM
Thanks, I appreciate it.