not sure what you mean by extreme? The two rear surrounds are a few feet behind the rear couch which works fine. Yes I would have liked them further back, but was unable. Now, for the front seating area, it is awesome. The side surrounds are to the sides as intended, and the rears are 8+feet back.

My rears and sides are perfectly symetrical to exact measurements to the primary listening position.

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