Marine Soundproofing & Boat Sound Deadening. On this blog, we will discuss the differences between marine soundproofing & boat sound deadening and provide a detailed analysis of which marine soundproofing products or boat sound deadening material can be fitted in which circumstance, Sound knows no boundaries until they meet specifically developed materials to absorb sound (marine soundproofing), be blocked by an acoustic barrier material (boat sound deadening) or a combination of the two marine