The rule of thumb is 1/3 into the room. If that doesn't work for your room 1/5 is the next best. Your seating position also should follow that rule. If this doesn't work for seating, Lugnut's comment of "experiment with absorbtion behind the listening position" is what you will need if you end up 1/5 or right at the wall as recommended by Audio Physics and Dunlavy. At any rate a min. of 8' and better at 10' between your ear and the tweeter.
The problem you may find in your room is that at 1/5 the depth will suffer, you may need acoustics on the speaker wall to help this.
BTW, I'm set up on the long wall, 1/5 for the speakers and 1/3 for my ears.
The problem you may find in your room is that at 1/5 the depth will suffer, you may need acoustics on the speaker wall to help this.
BTW, I'm set up on the long wall, 1/5 for the speakers and 1/3 for my ears.