MDF with a damping layer and drywall over it will reduce resonances very much. However, there are still 2 things to be aware of. One is, how much do you want walls that don't resonate or give? A concrete wall doesn't give, and you can imagine the bass mode problems you have in a concrete room. On the other hand, walls that don't give do reinfoce the low end, so you can see this can be a good or a bad thing. In most cases, you don't want absolutely rigid walls unless you had the perfect room with built in traps to relieve the pressure and no parallel walls creating high Q factor bass problems. The second aspect of this is why to use MDF material, it is very expensive for such large surface areas. It's used in speakers as both structure and low resonance. For walls you don't need the structural support so, multi layered drywall with damping material between it can achieve nearly the same low resonance factor (unless you are using the mammoth of all subwoofers at high volumes--but under normal conditions) at a much lower cost.
MDF for walls in music listening room
It was suggested to me to use MDF for the walls in this room and either stain or paint them or cover them with dry wall. I know MDF is used in speaker cabinet design. Has any one here tried it for the walls of a music room or have any ideas of how it would affect the characteristics of the sound in the room? Thanks in advance.