Even though my m60's have plenty of low bass, I still use a crossover setting of 60 or 80hz and let the sub play the low freq. effects. That wouls be the case with most floorstanding speakers. There is a lot of music with very low bass, without a sub you don't get the same experience or blend, that is just my opinion.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85