Re: Two 2" ports-vs-one 4" port???????
I have a reg cab ford ranger with a 12 in' P3 tuned to 32 hz with 2.25 ft3 air space. In a Reg cab ford ranger that is a fairly large box. I used two three inch ports by using a 90 deg elbow for both. The internal entry of the port is pointing away from the direction of the sub. The sub is placed directly behnd the driver seat and the ports exit from the box in the middle of the box between the driver and passenger one right on top of the other aprox 3 inches apart. I have very limited port noise not noticable at all actually. That sounds very very impressive for just one twelve, as you said no one believes it is only one sub stuffed in behind the seats of that tiny *** truck. Not to mention no one believes that the vehicle driving by is the white ford ranger regular cab slamming the BASS all over the place. Its fun. If I were you I would try the four 2" ports firing up if that is what you want. YOu can distribute them evenly acrossed the top of the box. If you are going with a single four inch port, I think you would get a tad bit of port noise. Four two's in that aplication would suit you fine. I always stick with 3 in. or above. But sometimes you are limited in what you are trying to accomplish. Good luck, and be sure to post pics.
Different People, Different Ways...