Audio only room furnishings?

I have a room in my home that I am starting to use for audio only. Sheet rock walls, 2 doors, hard wood floors and 8 foot ceiling and ONE chair only. Could someone refer me to info as regards treatments that should be made to the floor and walls? Do I need a area ruge? Plain floor and walls??? BTW the room is 14'-0 square. Thanks for the help,

Dean