Just ordered 3 cables to EA to use with ES100 or other Bluetooth adapters (45cm. each cable), looking for versatility. One pure copper (UPOCC litz), one mixed with same copper plus AuAg alloy, and one with pure AuAg alloy. All three use same mmcx and 2.5mm. plugs, so only difference will be the conductor material (great to compare and find the best match for every mmcx IEM in my collection ) Can't wait for them to arrive !