what's the best sub direction

what makes subs louder facing up or to the back or to the front thanks chase

That depends on a few things, the enclosure your putting them in,the vehicle your putting them in,etc.please give more info-A vision without a plan is just a hallucination-

03 eclipse and the box ther in right now is a 3.5 Qf sealed box but iam about to get a ported one next week .. thanks chase

I have seen alot of guys face the port towards towards the back glass,others towards the back.-A vision without a plan is just a hallucination-

whats works best is completely situational. to my knowledge there is no rule that says facing a sub a certain way is always better that another direction. it depends on your box design and the in-car acoustics.

if i was to take a swing at a box in an eclipse. first box i would build would be subs up hitting back glass and ports back.Team Southern Bass

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the most ideal situation is for the subwoofers to be as close to, and facing the back wall of a trunk (facing out of the car). The reasoning behind it is that when subwoofers produce soundwaves, they actually send one wave forwards and one wave backwards. By having the subwoofer as close to the wall as possible and facing it, the soundwave will hit it almost immediately and bounce back towards the cabin more in phase with the second wave it also initially sent. The more similar in phase the two waves are, the more additive interference you will get from the two waves overlapping. As you Move the subwoofer further away from the wall, the two soundwaves become increasingly out of phase with eachother, resulting in reductive interference. got first grant and best in show at the 2007 science and engineering fair (was a senior in hs) for doing my project on this :)

inflames989 wrote: the most ideal situation is for the subwoofers to be as close to, and facing the back wall of a trunk (facing out of the car). The reasoning behind it is that when subwoofers produce soundwaves, they actually send one wave forwards and one wave backwards. By having the subwoofer as close to the wall as possible and facing it, the soundwave will hit it almost immediately and bounce back towards the cabin more in phase with the second wave it also initially sent. The more similar in phase the two waves are, the more additive interference you will get from the two waves overlapping. As you Move the subwoofer further away from the wall, the two soundwaves become increasingly out of phase with eachother, resulting in reductive interference. got first grant and best in show at the 2007 science and engineering fair (was a senior in hs) for doing my project on this :)

In some cases this is true ,but in this case it would almost certainly be better to have the ports facing right at the roll of your hatchback.This would make the soundwaves as close to perfect as you could get .If you put it took close to the back wall then the sound wave hits the wall and goes splat!!!! everywhere,You want a nice clean roll off that is why the roll of your hatch back window is perfect-A vision without a plan is just a hallucination-

inflames989 wrote: the most ideal situation is for the subwoofers to be as close to, and facing the back wall of a trunk (facing out of the car). The reasoning behind it is that when subwoofers produce soundwaves, they actually send one wave forwards and one wave backwards. By having the subwoofer as close to the wall as possible and facing it, the soundwave will hit it almost immediately and bounce back towards the cabin more in phase with the second wave it also initially sent. The more similar in phase the two waves are, the more additive interference you will get from the two waves overlapping. As you Move the subwoofer further away from the wall, the two soundwaves become increasingly out of phase with eachother, resulting in reductive interference. got first grant and best in show at the 2007 science and engineering fair (was a senior in hs) for doing my project on this :)

what you are saying is more like how a ported box works by useing the rear wave to reinforce the front wave.  but, it really doesn't have anything to do with how you face the sub, it depends on the design of the box, sealed or ported.

if you are reffering to sealed boxes then you are just plain wrong. the point of a sealed box is to completely separate the front wave from the back wave

BS. You will never have an "ideal" rear panel that will reflect the waves evenly to actually have the desired outcome. Bytheway, you never want to obstruct the ports on a ported enclosure.