Stax SR-003 II In-Ear Electrostatic Earspeakers Click above to see Joe talking about a headphone experience like no other The SR-003MK2 is a 5-pin PRO bias type in-the-ear earspeaker, and can be used by connecting to a driver unit having 5-pin PRO bias output socket. The SR-003MK2 connects to STAX driver units or adapters equipped with 5-pin type PRO bias output.
