[Josuah]

Sorry, I meant by placement. I'm guessing the first graph was closer to a wall or corner, while the second graph was somewhere not as close, but a different distance from your seating position or positioned at a length from the walls that prevents the null.

So maybe you can find a corner or near-wall location that will boost your low frequencies again, while still having a position that prevents the null at your seat.

You probably don't want to boost it using EQ, because then you might overdrive your sub.