Before revision: The line in/out connections on consumer-oriented audio equipment are typically unbalanced, and connected with a stereo RCA jacks, or with a (0.14 inch, but commonly called "eighth inch") 3-conductor TRS minijack connector providing ground, left channel, and right channel.
After revision: The line in/out connections on consumer-oriented audio equipment are typically unbalanced, and connected with a stereo RCA jacks, or with a 3-conductor TRS minijack connector providing ground, left channel, and right channel.