Can You Mix/match Diff Diameter Port Tubes?

[westvan_dude]

Can you mix and match different diameter port tubes in the same enclosure space?

For instance two 6" tubes and two 4" tubes, add up the square inches of port area and then cut them all to the same length or would that sound f'd up?

Not sure if I have room for three 6" tubes in my design. I'd like to get as much port area as possible in the limited space I have.

Otherwise I'll just make a slot port between the upper and lower subwoofer. This is for a rear seat replacement design using two outboard seating positions with an armrest style centre section holding both subs facing up for the rear one and forward/up for the front one. F150 rear seat, s/cab.

Thanks!