I'm rebuilding a pair of floorstanding speakers. I have replaced the mid/tweeter with MB quart drivers and I am using the MB Quart crossover. I am going to buy a new crossover to split the signal, low to the 10" sub and high to the existing MB crossover. What frequency do you typically use for this? I listen mostly to rock and prefer tight bass to annoying bass. I am thinking 100hz to 120hz your suggestion and reasoning is highly appreciated.