AVR crossover question

[pearsall001]

I know that XO's are not brick walls & there's a slope to be taken into consideration. So, for instance if I set my AVR XO at 85Hz does that mean that it will let signal...let's say down to 75Hz & up to 95Hz pass thru? Or I am looking at it in the wrong way? I'm sure there's a more precise way of looking at it, but I'm a simple guy & like things explained in layman's terms...if that's possible on this subject. Thanks!