How much absorption do you want? According to this, cork will absorb as much as carpet:
http://greenhomeguide.com/askapro/question/is-cork-as-good-for-sound-absorption-as-wall-to-wall-carp...
Personally, I like it a bit lively.
http://greenhomeguide.com/askapro/question/is-cork-as-good-for-sound-absorption-as-wall-to-wall-carp...
Personally, I like it a bit lively.