squeak12 10+ year member
CarAudio.com Veteran
When using more than one port, you need to divide the box volume by number of ports and then calculate.
2 cubes net
2 4" Aeros
Calculate what you would need for 1 4" port with 1 cu. ft. net.
2 cubes net
2 4" Aeros
Calculate what you would need for 1 4" port with 1 cu. ft. net.