Check out Armstrong Ceiling products. They make some fabric that is hung in 'waves', the idea could be a great DIY project to tame your sound waves.
Room treatments on the ceiling?
Just curious for those with experience if putting absorption on the ceiling yielded benefits? If so, what was the improvement? I have some peaks caused by the ceiling/floor and front/rear wall interaction of modes. There is already a med pile rug in my room so I wonder if I need to add ceiling treatments too?