its funny cause luke actually sold me my subs and got me my re-cones for a steal of a deal and was a huge part in helping me get my car as loud as it is now. There is still more left in my car i know it and with some more work i am hoping for a 150+ in usaci trunk 1000+ and a 147 or higher in idbl stock 2. some people find the subs sealed off in trunk is louder where as others find un sealed is louder. I am gonna be trying a sealed setup for next year but for this year i went with unsealed and if u ask my a 147 is nothing to shake a stick at outta a trunk with very little deadner. Your best bet is to try multiple set ups and see what's loudest as every car is different. Good luck with it as its not easy by anymeans to make a trunk loud and be prepared to build more then one box as i am on number 4 and thinking of 5 and 6 already.

 

I know you live in the world of big dee-beez but not everyone is trying to pop the welds on their exhaust hangers.

Dude wants to know which way is going to give him the best pound. He wants to drop in his box, impress his buddies and **** off his neighbors, not be the next number king.

And in fact "scientists" DO design enclosures where the woofer is in close proximity to a wall. I've built a few - they are very effective in convertibles, jeeps, etc. This is called 'boundary loading'. Try some Google..

 

I think put it's face toward the roof this will help sub woofer wave travel more distance and generate more bass from it....

 

I was wondering about this myself. I tried two different boxes (Two Pioneer 12" Champion 307D2 in a ported box, and three JL 10W0V2, also in a ported box), facing both ways in my Mazda 3 sedan and the difference was obvious.

Facing into the cabin with the seats down yielded less rattle of the rear deck and trunk. Facing into the trunk (towards the rear, bouncing the waves off the trunk lid) yielded much, MUCH deeper bass.

 

Put it in the trunk facing it toward divining seat then experience it...

 

WEll, it's indisputibly conclusive; every car and opinion is different.

 

I did some experiments a few years ago to settle an argument about this. What I found was that the direction the woofers are facing makes no difference, only the physical position in the vehicle is important. Within reason of course. Jammed up against the tailgate so the woofers cant move wouldn't work very well. The farther back they were, the deeper they seemed to go. The reason is complicated and I'm a little pinned at the moment so I wont try to get too technical.
When you move the radiator forward, you end up with two reflecting boundaries instead of just one. These would be the front and rear of the cabin of course. When the subs are at the rear the front boundary is far away which is good. The rear boundary is close which means the reflection only reinforces the output (as DUKK mentioned this is boundary loading). Moving the subs forward doubles the number of primary reflections and causes some nasty comb filtering due to the late arriving reflections. This can be beneficial for SPL if you land the burp frequency on a response peak. Each car's cabin has a different reponse and the position of the subs is a big part of it.
A neat trick is to crack a front window an inch or two to let some of the energy escape rather than reflect back and cause cancellation. This will also tend to reduce peaks which is bad for all out SPL, but it's great for music programs.
Oh and I won the argument