I have not used available Software to create the management of Sound within my room, it is carried out using different configurations for absorbent and reflective materials.
The placement of materials used is now concluded and having Triangle Shaped Absorbent Materials in all Room Corners is a must have in my room.
This set up has a Absorbent used behind each Speaker.
Rockwool with a Mass of 35Kg / m3 and used at 100mm (4") Depth is an affective absorbent and a very cost effective method. It is good practice to create a small dimension cavity between inner face of Rockwool and the Rooms Wall.