<p>This paper investigated the design of various structures of different nonwovens and glass fiber composite felts to explore the influence of incident interface and multilayer overlapping structures on acoustic properties. The acoustic performance was characterized by the sound absorption coefficient, noise reduction coefficient, sound transmission loss, and sound transmission class. The results demonstrated that the type of nonwovens, acoustic incident interface, and layer sequence of the multilayer overlapping structure significantly affected acoustic properties. Nonwovens with high-air permeability as the incident surface achieved better sound absorption coefficient, whereas low-air permeability improved sound transmission loss. It was also found that nonwovens with low-air permeability were used as the incident surface, acoustic performance could be further improved by adjusting the stacking order of the multilayer overlapping structures.</p>