stereophonic

US /ˌster.i.əˈfɑː.nɪk/
UK /ˌster.i.əˈfɑː.nɪk/
1.

stereofonik

recording or playing sound in a way that separates it into two signals and produces more natural sound, or relating to this kind of sound:

:
With the advent of stereophonic LPs, Bernstein became one of the most recorded classical musicians in the world.