A special-order product, made to your personal specifications, various configurations available. Normally it’s around a 10 day lead-time.
Crystal Cable DUET can be terminated with almost all types of in-ear and over-ear headphone connections
For 4.4mm (Sony player) please add £40 for (Furutech) connector
Crytal Cable Duet purchases are not refundable due to the bespoke nature of the product