yaar Splfanatic
you know your FS of subwoofer is 30hz ,why did you tune it below FS??
its not good tunning for your subwoofer , all i can say your woofer will have some Bhur Bhur in below 30hz notes
bahi , Next time when you tune Enclosure Make it in between 33~36hz tunning frequency , Loudness will begin right after 2,3hz above tunning frequency
if you set it to 36hz , from 39hz its Sound pressure will increase where below 36hz Sound pressure Level will cutoff
to bring some loud , as it 3001 can do best , tune it to 36hz ,
where 33hz is very good ,