stereo
US /ˈster.i.oʊ/
UK /ˈster.i.oʊ/

1.
a sound system with two or more separate speakers, creating the effect of sound coming from different directions
:
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He turned up the stereo to listen to his favorite album.
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The new car has a great sound system with a built-in stereo.
1.
relating to or denoting sound reproduction involving two or more separate channels to give a more natural effect to the listener
:
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The concert was recorded in full stereo sound.
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These headphones provide excellent stereo separation.