This wire transmits signals through a coaxial cable, the center conductor is used to transmit signals, and the outer conductor is grounded to play a shielding role. Coaxial cables typically have an impedance of 75Ω, and this constant impedance helps reduce loss and interference during signal transmission. The structure of the RCA digital coaxial axis includes a central conductor, an insulating layer and an outer conductor. The central conductor is responsible for transmitting digital signals, and the insulation layer is used to separate the central conductor from the outer conductor, which acts as a shield to prevent external electromagnetic interference from affecting signal transmission. The impedance of the RCA connector is 75Ω, which matches the coaxial cable to ensure the correctness and stability of the signal transmission. RCA digital coaxial line is mainly used in HD image, multimedia computer, digital TV and home theater and other systems to transmit high-quality digital audio signals, such as CD, DVD, BD, etc. It delivers a clear, natural, realistic sound experience and is a must-have weapon for digital home theater systems. The quality of wire directly affects the effect of signal transmission. High-quality wires usually have better electrical conductivity and signal transmission performance. Factors such as wire diameter, conductor material and braid density should be considered when selecting wire. For example, oxygen-free copper wires and multi-level shielding designs can improve the anti-interference ability of the wire.