NKurszewski426I cannot vouch for their accuracy but according to Amazon...
' TFZ Series 3S improves on the original TFZ Series 3 by adopting a braided cable instead of TPU rubber. Furthermore, the resolution and soundstage of the Series 3S has improved compared to the Series 3.
TFZ SERIES 3 is designed to cater to the higher requirements of digital audio player. It has the best price to performance ratio among the TFZ series. '