ainawi

u got 5-6 ft3 for two subs... means 2.5- 3 ft3 per sub .. 1st of all if you pushing two subs with single amp then go with a single compartment i.e one port even two similar amps can work great ... about the tuning ... try to input your data in some enclosure design application like WinISD or bass box pro & get the box designed ... its not easy nor that difficult, if you havent done it before. tune the box around 37-40hz & you will stay in middle.... good luck

bro can i know what application u have used to design the enclosure.. looks new to me