<p>This paper investigates a novel wireless communication system that integrates Reconfigurable Intelligent Surfaces (RIS) with acoustic energy harvesting and multiple access schemes, specifically Orthogonal Multiple Access (OMA) and Non-Orthogonal Multiple Access (NOMA). Despite extensive research on RIS-assisted communication in Radio Frequency (RF) domain, the application of RIS integrated OMA/NOMA access and acoustic energy harvesting remains largely unexplored. We also study the effects of phase noise and imperfect Channel State Information (CSI). In the proposed architecture, the source node harvests energy from ambient acoustic signals and utilizes the harvested energy to transmit information to a remote destination through a RIS-assisted wireless channel. The RIS is employed to dynamically enhance the propagation environment by intelligently adjusting the phase shifts of its reflecting elements. We analyze and compare the performance of OMA and NOMA in terms of achievable throughput and energy efficiency under various acoustic energy availability conditions. Simulation results reveal that NOMA provides superior spectral efficiency compared to OMA, especially in energy-constrained environments enabled by acoustic energy harvesting. The proposed framework demonstrates the potential of combining RIS, acoustic energy harvesting, and multiple access techniques to enable sustainable and efficient wireless communication.</p>