If, you are not comfortable with your ears or you just want to be sure, the simplest way as onemug mentioned is to get an spl meter, you'll need to run seperate frequencies at 40, 50, 60, even 70 and see where each frequency peaks in your room. If you indeed have dips in the 60 to 70hz range, it may be beneficial to cross at 60... 60 is a spot though that peaks in many rooms, my guy instict would be to cross more like 40... good luck, Tim
