The C.E.C. ST 540 is a high-performance digital audio transport that primarily serves to deliver digital audio signals with exceptional fidelity. It typically features a robust construction that includes a solid chassis designed to minimize vibrations, which can adversely affect sound quality. The transport supports various digital outputs, including coaxial and optical connections, allowing it to interface seamlessly with a variety of external digital-to-analog converters (DACs). The ST 540 is often appreciated for its precise and accurate signal reproduction, making it suitable for critical listening environments. It may also include advanced functions such as asynchronous USB output, ensuring low jitter and enhancing audio performance. The unit is designed with high-quality components to enhance durability and reliability, further contributing to its functionality as a dedicated source component in an audio system.