Hey guys, I've been having this problem since day 1 with my shiva. It seems to constantly bottom out at frequencies in the 30-40 range. I've tried many different enclosures which include 3 cu ft ported to 22hz, 3cu ft sealed, 2 cu ft sealed. None of the boxes were braced nor did they have any fill. The amp is a 360 watt plate amp which has a boost boost of 4db at 25hz. I would like to know what the possible problem is with the setup because I want to build a 4cu ft ported sonosub for this set-up but I'm afraid it will be a waste of time and will bottom out like all the rest. Any helpful suggestions are greatly appreciated... Money is short as well so buying any new equipment wouldn't be an option.