Building custom sub box, need advice.

I just got a great deal on 2 Alpine Type R subwoofers, I already have a 15" sub but my coworker has these and when i heard the price I couldn't say no. My only issue is deciding how I should have them facing, currently I have my 15" sub rear facing, these subs might only be 10" but they really aren't that much smaller than the one I have now. SoI'm leaning towards a rear facing set up but also thinking of doing a downward firing set up or even a set up where I build a box that sits on the area where my rear seats currently sit and have it firing toward the top of my windshield.

Keep in mind I have an access cab so I already plan on removing the rear seats and rear console, I have no issues taking up the entire back of my cab but I also don't want anything big enough to draw attention to the fact I have a nice set up.

 

In out trucks firing the subs up and port up is one of the best options,
you can get away with building a box thats literally 10.5 inches by the width of the truck and by which ever hight ud need per say to reach desired volume.

Other advantage of upward firing is that its not as easy to damage the subs than forward ( your bags, tools, etc that u can toss in the back )

Buy a flared Pvc 6 inch port and tune it how you like it,( what type of music do you listen to)

Lastly, this said box is super easy to build.
Most places have a big band saw.. Since the dimensions of most of the box is very close to gather you will only have 3 different sized panels, with 2 being the same length

Gl and have fun. Pm me if you need any additional help

Ps dont downfire

 

Sub up port up gives the best sound. From my test I've found that port on driver side gives the best result.

 

yes port driver side is loudest in 99% of applications on a Termlab meter on the passenger dash

 

Hmmm now I just need to come up with a design and to integrate the hump in the back of my access cab. I'll come up with some dimensions for this box tonight and post them up here to see what you all think. That's the only thing I hate about my access cab truck, it makes designing a sub box a nightmare. But upwards facing and ported sound like a winner.

EDIT: After taking a ton of measurements I realized the back of my truck would require a custom box insanely complicated to fit the subs the way I want them. I have decided to just get 2 rear facing boxes, 1 behind each seat. My 15" sub sits that way now and it sounds good, having 2 behind each seat will equalize the sound in the truck, might not sound as good as upward facing subs but unfortunatly I am limited by the space in my access cab.

 

Then face them forward, rearward fire is total crap
Make sure you port the boxes.

How is the box complex ? if memory serves me right you can literally just build a box like i described