6th order for DC Audio Level 5 12 inch how much cuft i need for it ?

[As-21]

i got a daily ported 1.5CUFT net with 16 square inch per cuft tuned to 34Hz.

I am looking for a box for daily proposes that will played much louder.

I understand the 4th doesn't recommended for my subwoofer so i want to ask

if 5.5cuft space i got for 6th is enough ?

also looking for threads with 6th on level 5 if know one.