RCA connector
An RCA plug, also known as a phono plug, is the RCA plug in America. It is a coaxially constructed plug for unbalanced signals used in consumer electronics and semi-professional audio and video.
The RCA cable required for the RCA connection is a coaxial cable consisting of a centrally placed cable core surrounded by a dielectric. This, in turn, is surrounded by a braided shield and the cable jacket. The shielding protects the inner signal conductor against interference radiation from outside and prevents interference emissions from the inner conductor.