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View Full Version : 2 9515's box help - dodge magnum



xxlmagnum
05-12-2012, 06:38 PM
hopefully i can get these monsters in here...two dd 9515i's on two m3a's in the back of my 08 dodge magnum. looking to get 4-4.25 cubes per speaker tuned to 32hz. max dimensions are 21" l x 40" w x 23" h, if i am right roughly 11 cubes before displacement?? can i do this??

double 07
05-12-2012, 10:49 PM
Those dimensions are more like 9.3 cubes and that's not counting all of the displacements.....

xxlmagnum
05-12-2012, 10:59 PM
Shiiiiit this isnt good news......i need to figure out a way to get these in here.....

double 07
05-12-2012, 11:01 PM
A sawzall and hammer come to mind!!!!!!!!..........lol

xxlmagnum
05-12-2012, 11:04 PM
so question then....single 18 or two 12's???

bumppinKota
05-12-2012, 11:06 PM
if you change your height to 27... if thats possible... that will put you at 11 cubes if my math is right

double 07
05-12-2012, 11:07 PM
There is a local guy here with a single 18" DC Audio level 4 and about 3k doing a 153...........In a Magnum.......of course his box is tuned at 45hz.............I would do the two 12s if your plans are to listen to music decently......

xxlmagnum
05-12-2012, 11:08 PM
All i need is 4-4.25 cubes per 9515....so like 8-8.5cu ft NET for these still not sure how my dimensions wont work

double 07
05-12-2012, 11:15 PM
because a decent sized port is going to take up 1.5 cubes of the space you have to work with unless you want to tune it to 50hz.........I just played with the numbers....with 35 hz tune and decent amount of port area you are netting about 7 cubes........you might use aeros and get a little more....

bumppinKota
05-12-2012, 11:16 PM
i thought your original specs were good. just you said you were looking at 11 cubes... lol i just changed one number to get you at 11 cubes. i think your on the right track... but thats just me.

bumppinKota
05-12-2012, 11:17 PM
oh i forgot to calculate the port...

double 07
05-12-2012, 11:19 PM
21" x 40" x 23" with 3/4" wood will NOT net 11 cubes on any calculator.......sorry

bumppinKota
05-12-2012, 11:21 PM
21x40x27 will

double 07
05-12-2012, 11:23 PM
He probably can't do over 23" if he plans on the hatch closing.........lol

xxlmagnum
05-12-2012, 11:26 PM
yeah dude kinda want my hatch to close...and no way i can place my m3a's underneath the false floor they would go up in flames real quick....**** im stuck

bumppinKota
05-12-2012, 11:29 PM
yea thats probably true haha.

Buck
05-12-2012, 11:30 PM
You are stretching it with space man, I'd be better with something else, you aren't going to have proper airspace.

xxlmagnum
05-12-2012, 11:33 PM
buck, given my dimensions i listed on page one can we make two 12's work??

bumppinKota
05-12-2012, 11:34 PM
would mounting the speakers upside down help anything or is the just an appearance thing? never tried it just thinking out-loud.

Buck
05-12-2012, 11:36 PM
Inverted mounting is for looks, I don't like it personally.

Yes, we can make 2 12's loud man.

bumppinKota
05-12-2012, 11:40 PM
me either and wasn't sure if it had any benefit but thanks for clearing that up

xxlmagnum
05-12-2012, 11:41 PM
buck lets get something designed for two 12's then get this thing banging

papermaker
05-13-2012, 12:03 AM
Take my advice and go with 1 18s..
It's much more ideal in that cabin....
Also use birch ply with bracing, mdf is to **** flexible, and it's stupid heavy...birch is nearly 2x as stiff..
if you do your original measurements with 85in^2 of port area you will be good..
No need to tune under 34..
single baffle but braced..
Sub on drivers side close to the side an bottom as possible..
Port 21.5"Hx4"Wx15.5"D..and put a 4"Wx20.25"D peace dead center of the port to act like a divider/brace..
for the L side you need a 4"wide peace by 21.5 high..
Don't need to brace it reall 5 screws will reinforce it enough..
To brace the box find the distance from the center of the sub to the beginning of the port opening Divide by 2 and put 2 pieces of 3/4 back to back cut at 45 degree angles(so it makes a point) screw and glue the together and put no more the 2 screws per side..
I recommended you cut the braces a hair long to where you have the mildly tap them in place, this ensures no flexing and a secure bond betweent the panels and braces..
It will knock your head off b..

Ronny
05-13-2012, 12:10 AM
Maybe you should experiment with a few 6" aero or 8" aero(s) and see where you get. Dual 15" drivers with three 6" aeros might be enough port area, or one or two 8" aeros. I'll crunch the numbers when I get to a computer later.

xxlmagnum
05-13-2012, 12:14 AM
papermaker i appreciate all that bro but i dont think a single 18 can handle 2 m3a's daily def not gonna happen...how much louder would the 18 be compared to the 12's?????

Buck
05-13-2012, 12:23 AM
We can make a single 18 work too.

---------- Post added at 11:23 PM ---------- Previous post was at 11:22 PM ----------

If you want. But you are right on the power. Not many single woofers going to take the power you have daily.

xxlmagnum
05-13-2012, 12:29 AM
i really like the 2 12's idea better....both subs will have proper air space and enough port area to perform properly...i do like the 34hz idea though i really just want a daily groundpounder that murders the lows

papermaker
05-13-2012, 12:56 AM
It's perfect for the single 18..
Ill tell you a secret.. If you strap the amps @4ohm you will get about 6-8% efficiency gain. At those levels of current draw it could mean the difference of winning and losing ;)
On top the additional cone area it's sure to be noticeably louder than the dual 12s!

assassin1840
05-13-2012, 01:01 AM
We can make a single 18 work too.

---------- Post added at 11:23 PM ---------- Previous post was at 11:22 PM ----------

If you want. But you are right on the power. Not many single woofers going to take the power you have daily.good guy right here. great price and does it quick! did my last design and i will be going to him for future projects..

Kangaroux
05-13-2012, 01:02 AM
It's perfect for the single 18..
Ill tell you a secret.. If you strap the amps @4ohm you will get about 6-8% efficiency gain. At those levels of current draw it could mean the difference of winning and losing ;)
On top the additional cone area it's sure to be noticeably louder than the dual 12s!

Not unless those 12's are in a bandpass lol...my single obsidian 12 spanks my 18 in terms of output when it comes to <30hz ;)

Full Tilt
05-13-2012, 01:28 AM
There is a local guy here with a single 18" DC Audio level 4 and about 3k doing a 153...........In a Magnum.......of course his box is tuned at 45hz.............I would do the two 12s if your plans are to listen to music decently......

2 12s, done correctly, could beat 153.

papermaker
05-13-2012, 01:58 AM
Not unless those 12's are in a bandpass lol...my single obsidian 12 spanks my 18 in terms of output when it comes to <30hz ;)
Band pass isn't louder, if you put you 18 in 6 cubes tuned to 25 with 150in^2 of port area you will get similar results..
I've done a lot of installs and I've yet to use a bp over a properly built ported box.
if you want more output I can help with a transmission line ;)
I've done 145-146 legal @25hz with 2 he 10s and a Lanzar 1000d..
I assure you the single 18 will out displace the dual 12s..

papermaker
05-13-2012, 01:59 AM
It's all about efficency and displacement, the 18 will be louder with less power..

hispls
05-13-2012, 02:10 AM
Not unless those 12's are in a bandpass lol...my single obsidian 12 spanks my 18 in terms of output when it comes to <30hz ;)

Well that makes it a proven fact that 12's play lower than 18's

Kangaroux
05-13-2012, 02:17 AM
Well that makes it a proven fact that 12's play lower than 18's

We need to write this **** down stat.

---------- Post added at 02:17 AM ---------- Previous post was at 02:16 AM ----------


Band pass isn't louder, if you put you 18 in 6 cubes tuned to 25 with 150in^2 of port area you will get similar results..
I've done a lot of installs and I've yet to use a bp over a properly built ported box.
if you want more output I can help with a transmission line ;)
I've done 145-146 legal @25hz with 2 he 10s and a Lanzar 1000d..
I assure you the single 18 will out displace the dual 12s..

That just seems like a waste at that point lol

papermaker
05-13-2012, 02:39 AM
There is a reason the loudest vechile in the world uses 18s;)

xxlmagnum
05-13-2012, 09:12 AM
so much thanks for the words of wisdom papermaker hell yea and a single 18 will save me $$$.....buck i'll be sending a request your way for an 18" design man again thanks everyone

Buck
05-13-2012, 10:35 AM
There is a reason the loudest vechile in the world uses 18s;)

Alan Dante did a 183.4 with 12 12" Z series on 210,000 watts in a 6th order bandpass :fyi:
He did do like a 180.2 or 181.2 with a single DD Z 18 iirc.

RAM_Designs
05-14-2012, 01:24 AM
put you 18 in 6 cubes tuned to 25 with 150in^2 of port area you will get similar results.

Have fun with that nearly 100" long port that displaces roughly 9.5ft^3.

papermaker
05-14-2012, 02:49 AM
Yea, lol but wave length well be close to perfect and qt for port will be threw the roof, I'd bet u could pull low 150s..

The_Grimy_One
05-14-2012, 03:08 AM
Alan Dante did a 183.4 with 12 12" Z series on 210,000 watts in a 6th order bandpass :fyi:
He did do like a 180.2 or 181.2 with a single DD Z 18 iirc.

Thats a lot of POWA!

papermaker
05-14-2012, 03:33 AM
That y u use fuses..
Can you put the under ur seat?