Is there a real difference, say between 35 and 37 Hz? I made a box and it was supposed to be 35, but recalculating it, it turned out to be 37 Hz. Think there's going to be a difference? Also, by inverting the subs, I know the internal volume will be larger. Would this make the tuned Hz dip lower or raise it? The subs are both in a divided slot ported box.
im pretty sure inverting the subs will make the tuning freq drop slightly 1, maybe 2 Hz like your thinking - pending on how much extra volume that leaves