well at a local sound store they have a 2.5cu ft dual ported box and a 1.25cu ported box, only thing is they are 160 & 120 dollars. I have a option to get a custom box but it will run me more than that. The bigger one has 34hz freq, im pretty sure the smaller one does. From what i know and seen this is perfect. Im now just thinking i will go with the one at the store.. I like the 1.25cu because it is smaller and cheaper but i like the 2.5cu one because my amp will fit ontop if it, Its a biiig amp what would you guys do