Caravan 2003 project
01-25-2009, 01:31 AM
#1
Caravan 2003 project
Well, after some good guidance by MR2NR, I purchased some nice accessories. My first project is to replace the subwoofer since the previous one just didn't have enough oomph and got stolen anyway.
I did my research but am still left with a few questions.
I want to build a vented box for my sub but how do I determine the frequency I want? I got that it's called Fb. The speaker sheet came with the Fs, I managed to calculate the Fc, but what about the Fb ? Since the length of the port will depend on it I assume I absolutely have to get it right.
What software do you use to make the drawing? I have tried Google sketch and BassBox 6. Bassbox does a pretty good job at it but it doesn’t quite get the angles correctly.
The best place I found to set my sub box is on the third row seat. I frequently use the 2nd row seats, but very rarely the third. I wanted to keep my cargo area free and I also wanted to make it so that I can easily remove the sub box and seat for when I need the full cargo area. I will use a connector for the wirer to make it easy to unplug. I am also thinking of some sort of a seat belt strap to attach the box to the seat in case of crash. Can you just imagine this monster coming flying to the back of your heard?
Pioneer recommends a box between 1.25 and 1.75 foot. BassBox tells me the one I draw is 2,2 feet, but it doesn't take into account the space used by the port. With a decent software and a scaled drawing, I imagine I'll be better set to calculate the exact cubic area.
The head unit I already had. Kenwood KDC-MP628
The new gear. Pioneer TSW-120D2 12 inch sub & MB Qart Mon Amp DSC500.1
Where I want to make it fit and my improvised jig. I had to make a jig because trying to make the measurements on a seat, the angles and length varied depending on how I was holding the tape or pressing on the cushion. There was also the slight detail of being -23 degrees and -30 with the windshield today. Kinda made me measure fast.
The drawings. The first one is sort of what I want to do. Just don't know how to draw it properly. The vent is also one that I am not sure how long to do it.
The type of butt cuts I'd like to do (got that picture from somewhere else can't remember, probably here)
I did my research but am still left with a few questions.
I want to build a vented box for my sub but how do I determine the frequency I want? I got that it's called Fb. The speaker sheet came with the Fs, I managed to calculate the Fc, but what about the Fb ? Since the length of the port will depend on it I assume I absolutely have to get it right.
What software do you use to make the drawing? I have tried Google sketch and BassBox 6. Bassbox does a pretty good job at it but it doesn’t quite get the angles correctly.
The best place I found to set my sub box is on the third row seat. I frequently use the 2nd row seats, but very rarely the third. I wanted to keep my cargo area free and I also wanted to make it so that I can easily remove the sub box and seat for when I need the full cargo area. I will use a connector for the wirer to make it easy to unplug. I am also thinking of some sort of a seat belt strap to attach the box to the seat in case of crash. Can you just imagine this monster coming flying to the back of your heard?
Pioneer recommends a box between 1.25 and 1.75 foot. BassBox tells me the one I draw is 2,2 feet, but it doesn't take into account the space used by the port. With a decent software and a scaled drawing, I imagine I'll be better set to calculate the exact cubic area.
The head unit I already had. Kenwood KDC-MP628
The new gear. Pioneer TSW-120D2 12 inch sub & MB Qart Mon Amp DSC500.1
Where I want to make it fit and my improvised jig. I had to make a jig because trying to make the measurements on a seat, the angles and length varied depending on how I was holding the tape or pressing on the cushion. There was also the slight detail of being -23 degrees and -30 with the windshield today. Kinda made me measure fast.
The drawings. The first one is sort of what I want to do. Just don't know how to draw it properly. The vent is also one that I am not sure how long to do it.
The type of butt cuts I'd like to do (got that picture from somewhere else can't remember, probably here)
Last edited by Stephane; 01-25-2009 at 01:38 AM.
01-25-2009, 10:22 AM
#4
with 2 kids a wife and my 2 other babys in the trunk ( subs ) i still have all the trunk i need. y the seat. lol. i wouldnt put it there if my life depended on it. ( scary there )
i dont know if you have a grand or just the regular but i have luck as of sql at 35hz
i dont know if you have a grand or just the regular but i have luck as of sql at 35hz
01-25-2009, 03:06 PM
#5
Don't know if this will help, but my old Aerostar ended up with this box first:
That worked OK but then we re-arranged the seating so I did this box:
Both sounded fine, there was more room for people and stuff with the second row bench out......
Personally I would never put a sub box on a seat.....the possibilities of it flying around in an emergency are too scary for me to take a chance on.....
That worked OK but then we re-arranged the seating so I did this box:
Both sounded fine, there was more room for people and stuff with the second row bench out......
Personally I would never put a sub box on a seat.....the possibilities of it flying around in an emergency are too scary for me to take a chance on.....
01-25-2009, 03:39 PM
#7
500 Watt CAFz'r
Join Date: Sep 2008
Posts: 819
PTS just build me a box for a 15" to go behind the last seat and i dont even have the grand...
01-25-2009, 06:30 PM
#8
As mentioned that would be scary as hell to have coming at you in an accident. I have a 2001 Caravan shorty and I'm putting a 4.5cuft @ 38hz ported box going in the rear hatch and it still leaves me with room on top 
With all my seating.
With all my seating.
