The dB loss you measure per doubling distance would be the same in any situation. Proper treatments will assist in a flatter frequency response within your room (bass traps, panels) however most people with properly furnished rooms will be fine. You will come to a point where you will rather just enjoy the system versus worrying about 1-2dB's which you can't perceive anyway.

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