You would not want to turn an m80 on its side and 2 150's side by side most likely would resolve nothing, if anything it would widen the center sound stage and give you less seperation from the left/right speakers.

Not sure I understand what your trying to accomplish.

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