you will have to experiment, I would start with 80hz, but I found my m22 on walls worked better a little higher than that, since my ep350 could do a better job in bass above 80hz.

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