1 earphone bud died from contact point.
Observation is that a mono acoustic signal in 1ear from an ear bud works as well as if both are working. Diff is depth of 3D sound wave generation. Brain is capable of generating the other missing half of stereo signal.
Brain is able to map out missing signal by virtual inference to give same effect as if both ears hearing different stereo signal.
Doesn’t work if listening to mono via both ears. Maybe due to initial setpoints of neural cell growth from birth. Might be different results with new generation of kids raised in stereo and 3D sound signals only.
Live~NRGY 
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