In auscultating the heart I prefer the binaural stethoscope of the Ford pattern.
Again, it is generally asserted that binaural hearing is of great importance for the recognition of the direction of sound.
This is the common form of a binaural resonating stethoscope.
It was a binaural, ultra-fidelity job, and I could close my eyes and feel the orchestra in front of me.
The binaural stethoscope was invented by Cammann in 1854, and a later improvement is the phonendoscope, by Bianchi.
binaural bin·au·ral (bī-nôr'əl, bĭn-ôr'-)
Having or relating to both ears.