sparkplug121988 10+ year member
SWINE FREE!!!
I am looking to build a box for a single 18". The sub is fully loaded and will be going into a 06 malibu. Im looking to seal the box off from the trunk. I want to do a swithcable port. I want one port around 32hz or so and the other for spl. My question is what should the box size be and port area be? I was told for the btl that 4cf with 100sq of port would be the best. What have you had luck with? Keep in mind that this will be in a trunk of a car so not alot of room.