Ok got a system in a car and you know with your subs being in the trunk when you drop you backseats down it sound a whole lot deeper and better. What I was thinking is making some type of ports or slots tubes that sets in between my trunk and my seats and comes out on the inside of the car. Do you think it will give the same effect as the seat being folded down? I've already got a great idea to conceal it if it works
Yes, you're right. That is called coupling the air. That's the reason hatchback sound so good! If you have a nice car the seats are probably thick and you don't get all the bass your subs make. What you can do is if you have ports going out of the top of your box, you can extend them into the cabin by replacing the existing ports with longer ones and cutting our the appropriate wholes in your rear dash. You have to make sure that the ports are tightly bound to the dash so that the only air that gets through is directly from the box.