sony xplod 6th order - 28hz response, what?

alright so i built a 6th order box to test the sony’s. the first box was 4 cubes at 32hz and 1.8 cubes at 59hz. and well that wasn’t working to well. (4 cubes for 2 10“ = not good) so i changed it to 3.2 cubes at 36hz and 2 cubes at 62hz. as a result the xplods are not as loud as the skar vvx-15 in the t-line but they are cheaper and are on less power than the skar. the xplods get alot lower than the skar which i thinks pretty funny considering people say xplods cant get low. not bad for $30 subs.