You do not need to soundproof your entire wall, floor, or ceiling for your room to sound quieter. Instead, you only need to install acoustic treatment materials on the places that the soundwaves directly hit. For instance, if you plan to treat your home studio acoustically, you need to identify which part of your walls the soundwaves bounces off when you are recording. Once you have found out, the next thing you need to do is apply the acoustic treatment directly to those areas so that the materials can absorb the soundwaves and echoes, preventing them from circulating your recording studio.