Stop bass travelling
Low frequency sound waves with long wavelengths can easily pass through standard drywall structure, which means that without the right soundproofing materials, the low frequency sound can generates vibration and rattling that may lead to annoyance. Sound absorbers, bass traps, and diffusers will also not be able to prevent sound transmission - although they can greatly improve rom acoustics.
Well-known solution for every need
Increasing the mass of the wall is a simple trick to improve your soundproofing, however this way means the construction cost is higher many times and makes your walls significantly thicker but effect is inadequate. And another technique for Audiophile is to "isolate" the walls of the room. The perfect solution is to use Remak® Isosound SSBU60 to create an absorbing layer between the wall and the external soundproofing layer.