I am trying to figure out the best place to put a port in my box. I want to build a ported box in the same design as the standard camaro/firebird boxes. The one I am working from sits high in the well and the front edge sits on the gas tank hump and shows a surface of about 4" tall facing forward in the car. If I am building this for SPL which is the best direction to face the port? Should it faces up into the back hatch like the subs or should it come out of the front surface I was talking about and fire straight into the back seat of the car? Any ideas on which is best?

 

For the best results fire the ports on the same side as the subs.

The purpose of a port is to catch the frequencies that the speaker produces INSIDE the box and "tune" them so they can be heard outside the box. That's why there's usually an increase in SPL by switching to a ported box.

If the ports are on a side other than the speakers, the tuning can be off enough to make it sound like poop.

 

AJ
Do you think it hinders performance to bend the port? My problem is that the port is supposed to be 14.5" long. I was trying to locate the subs as close to the center of the car as possible and that means that I don't have 14.5" of depth in the well on the ends. I was told that the port should not be placed between two subs. According to them, two subs will work better the closer the are to each other in the chamber. Do you anything about this? I appreciate your help.

 

the sound waves are so large at the tuning frequency, that the location of the port is pretty much unimportant, especially considering that it's all being directed forward within the back of your car anyway. I built a box for a thirdgen.org member that had the 2 flaired ports facing forward, with the subs facing up. It hammered.

 

Cool, sounds good. That is exactly what I wanted to do. The box is for two subs that take 3ft^3 per sub. The top of the box extends about 30" from the back of the car so there is about 14" of it laying on top of the gas tank and it is about 4" high there. What I thought about doing was making the port 2"x12.5" with the slotted opening firing out the front. That makes cutting the port a lot easier. Thanks for the input.