[Douglas]

Dont be shy on furniture. Place a couple of side tables into the room and place objects on them for decoration and diffraction.

Place a carpet between the listening seat and speakers. Do not place a table between the listening seat and speakers, only the carpet.

Ensure you have heavy curtains on the wall behind the speakers. Place bookcases with books and your music collection behind the listening seat on the back wall. The general rule is dead behind the speakers, live behind the listening seat. Place a couple of paintings on the walls.

Adjust speakers and enjoy music. There is a lot one can do with normal furnishing before investing in expensive acousting devices. Make sure you have a lot of stuff (that you like) in the room to create absorption and diffraction.