The Stax SRS-3050 MK2 Classic System comprises the SR-303 Earspeakers and SRM-323 MK2 driver unit.

SR-303 (Earspeakers):

Featuring the same element material as the SR-404, the Stax SR-303 is a startling innovation in a more affordable Earspeaker package. The sound is both refined yet powerful and the unit comes complete with a low capacitance standard PC-OCC cable to allow the Stax SR-303 Earspeakers to attain their full sonic potential.

SRM-323 MK2  (Driver Unit)

Containing a large, high-speed, large-capacity power transformer, the Stax SRM-323 MK2 Driver Unit depicts the texture and tone of musical instruments in a powerful manner and has the capacity to recreate passages of low sounds dynamically without falling into heaviness. Through the use of a simple new circuit configuration and high sound quality parts, the STAX electrostatic Earspeaker drive unit SRM-323 MK2 achieves an even more natural spatial reproduction capacity. The sound quality is indisputably at the top end of the scale.