OK so i bought 2 Dc lvl 2 12's and i want to know if the box for my old subs would be ok or if i should build a different one the one i have now is 5.38cuft with the sub displacement accounted for in torres box calc and the site says 1.25 each ported but i think i will probably be under powering since Dc subs are under rated and the amp i have is a vibe black box bass 5 rated at 1500rms at 2ohm and it is a mono block so any help would be appreciated thank you