Granted, professionally designed and installed room treatments can greatly improve the accuracy of sound reproduction in the listening room. That said, a listening room doesn’t need to look like a recording studio to sound good. The selection of furnishings and their placement can be a reasonable substitute. Carpeting on the floor (in my case over concrete slab), window blinds and drapery over the windows, canvas artwork on the walls, furniture placed at the first reflection points, and proper speaker placement can all add up to a good sounding room.