mono - stereo

ref _ https://music.stackexchange.com/questions/24631/what-is-the-difference-between-mono-and-stereo/24635

The difference is in the number of channels (signals) used. Mono uses one, stereo uses more than one.

• • In monaural sound one single channel is used. It can be reproduced through several speakers, but all speakers are still reproducing the same copy of the signal.

  • In stereophonic sound more channels are used (typically two). You can use two different channels and make one feed one speaker and the second channel feed a second speaker (which is the most common stereo setup). This is used to create directionality, perspective, space.

Mono

Stereo