There might be several loudspeakers along a railway platform, or hundreds around an airport, but the signal remains mono. It need only be emitted from one loudspeaker or earpiece, but you can have as many as you like and the signal is still mono. A mono sound signal contains no directional information, one microphone picking up whatever sound there is wherever it comes from.Stereo recordings create an illusion of space when played back correctly, each aural field coming from the correct direction. The left aural field is captured by a microphone pointing in that direction, and the right field by a second microphone pointing to the right (you will also find stereo microphones that have the two directional microphones built into one piece). Consequently, the two fields need to be kept separate throughout the whole process from recording to storage to playback. A stereo sound signal contains synchronized directional information for the left and right aural fields.Never connect these outputs to a line or microphone input, there’s no telling how far the damage will spread. Loudspeaker outputs (from power amplifiers, tape recorders, radios etc) are very powerful, rated from a few Watts to hundreds of Watts (depending on the design), providing the energy needed to drive loudspeakers.In any case the output for earphones has usually been modified by bass and treble filters and is no longer true to the original sound, so it’s not a suitable quick solution, however tempting it might look.
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