Current box is ~1.8 cu/ft net each sub @ 35 hz, 45 sq in port area. Daily Driven, 2001 Bonneville.. 139.7 @ 42 hz, sealed on dash, stock electrical, ~1400 watts. I'm thinking about adding a third sub and stepping up to ~7 cu/ft tuned to 32, and more wattage + Big 3 + Battery. I listen to mostly Rock and Metal, I built the box kind of small under the impression that it would sound better for that type of music, but I'm always up for louder! Someday I'll quit being lazy and take some pics... Maybe.