Use this adapter to connect a headphone cable with a 2.5mm TRRS for Astell & Kern or a 3.5mm TRRS for Hifiman HM901 or RSA/ALO/Cypher Labs connector to a 4 pin Male XLR.

Female RSA Connector

Converts a female RSA connector to a male 4-pin XLR.

3.5mm TRRS Connector

Converts a 3.5mm connection to a male 4-pin XLR.

2.5mm Connector

Converts a 2.5mm connection to a male 4-pin XLR.