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jeep_poundin
05-09-2009, 09:11 AM
im putting 3 12" 9500's in my jeep grand cherokee. the pic is what im looking for on how the subs are mounted and where the ports are going. the dimensions are the max height and width. height is short cause i want to keep it below the tops of the seats. as for the depth, that can be determined from the box volume and the ports. can anyone help me out with a recommended volume and port size?? thanks

http://i42.tinypic.com/qxt1j5.jpg

jeep_poundin
05-09-2009, 09:55 AM
this box here would work too as for the layout. the depth would be 22" and height 17". the port is 82insq and its tuned to 34. and the volume is 6cuft. so is 6cuft tuned to 34 a good box for these 3 subs??

http://i40.tinypic.com/xmjvqg.jpg

dappa5
05-09-2009, 10:26 AM
as far as volume what does mtx recomend??
general rule of thumb for ports is 12-16 sq/in per cube for example 2 cubes=24-32 sq/in of port area
however every application is unique I've gone as big as 21 sq/in per cube
so determine your volume generaly (prefferably after all dissplacements i.e. driver/port/gussets etc...) then play with port length to tune :D:D:D gl

dappa5
05-09-2009, 10:28 AM
besides in that cherokee you should run subs up / port back

jeep_poundin
05-09-2009, 11:03 AM
mtx recommends 2cuft per sub. but some people think subs sound better with more than whats recommended. i just sold my system of 4 type rs and they were subs up port back but the box bounced around to much.

dappa5
05-09-2009, 11:25 AM
bolt it down

jeep_poundin
05-09-2009, 11:28 AM
and another thing, i want to be about to have a little cargo room on top. so putting the subs up would kinda take up that cargo room

dappa5
05-09-2009, 11:28 AM
other wise you're right in there
i would do all three subs up and two 3.5x12 port along the bottom of the back

dappa5
05-09-2009, 11:29 AM
yeah but box will pound better

jeep_poundin
05-09-2009, 11:37 AM
i guess i can do that. i can always run a thin layer of plexy up about the subs so i can throw stuff on top.

jeep_poundin
05-09-2009, 11:40 AM
up on top the subs****

Random1010
05-09-2009, 11:40 AM
The box shouldn't "bounce around." While playing it should be as normal as when not playing. Maybe a better box is in order.

dappa5
05-09-2009, 11:42 AM
i make "table top" with legs to protect subs when needed

jeep_poundin
05-09-2009, 11:42 AM
the top where the subs were had only one sheet of 3/4" mdf. so maybe thats where it was getting its bounce. the top was flexing to much. so i could double or tripple the top on this one

jeep_poundin
05-09-2009, 11:43 AM
i make "table top" with legs to protect subs when needed

good idea. that way i can just put it in and take it out when needed

dappa5
05-09-2009, 11:44 AM
The box shouldn't "bounce around." While playing it should be as normal as when not playing. Maybe a better box is in order.

by better do you mean heavier or custom fit to vehicle or both lol :D:D

Random1010
05-09-2009, 11:47 AM
by better do you mean heavier or custom fit to vehicle or both lol :D:D

Neither. Better as in superior to your current box.

A good box shouldn't flex or bend at any point, so it shouldn't be able to move at all without some outside force.

dappa5
05-09-2009, 11:54 AM
i was just making a point bout the right box for both subs and vehicle and i do concur bout no flex

siucsaluki11
05-09-2009, 02:14 PM
I went from a sealed box in my blazer to subs up port back, to subs and port back (trying to gain a little cargo room). So far the subs and port back hit hardest in my blazer. But the last box i did was also the best one i have done so far and its 5 cubes after displacement tuned to 30Hz instead of 4 ft^3 @35Hz.

I have had one time so far where i needed and used the cargo room. And if i had the money to build a plexi table top thing i probably would still leave it at subs and port back for my current setup. My next one will be subs and port up probably (depending on what i go with)