JBL Tune 750BTNC 2018 Dec - 2019 Nov JBL Tune Series is the low end production line on JBL headphones, also it is the ones contributed mostly regarding JBL headphones revenue. I was lead designer of this over-ear headphone design from begining till mass production. propose different color SKU options, I learnt some ME and ID knowledge about how to work an over-ear headphone project