Crossover change

Hi all.  I have a Marchand Electronics crossover which is set at 100 Hz.  I was able to get modules that are set at 80 Hz.  Phil Marchand says it plugs right in. I currently have the Crites Type B which have the large 15 inch woofer.  This system already has serious bass slam. I think I will still have plenty of power from my Pass XA25.  I know I could just try this but I wanted to hear predictions about what this will do to sound quality.  Or if it is worth it.  I am not out much money either way.   We could even have a contest for who predicts the "right" outcome.