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  • Your Earspeakers’ Best Friend

    The SRM-252S has been exclusively designed for STAX earspeakers. This driver unit works as an amplifier. Pair your headphones with the SRM-252S and enjoy the best that the world of music has to offer.

    Connects to All

    With its high-quality PRO-bias 5-pin connector, the STAX SRM-252S can directly connect to a portable audio player, CD player or PC via its audio output terminal. You can also simultaneously connect it to a loudspeaker thanks to the parallel output terminal.

    The Finest Music

    New high-voltage transistors and low-noise FETs are carefully selected for the best audio experience. Smooth and rich sound is produced by the output stage thanks to the emitter-follower configuration. The class-A amplification does not have any coupling capacitors. This lets you hear your music with every detail crystal-clear.

    Beauty with Functionality

    The SRM-252S features a simple design that is high on functionality. This driver unit is the size of a CD jacket case. The aluminium extrusion chassis does away with the heat caused by the inbuilt class-A DC amplifier while at the same time, improving its reliability.


  • Specifications

    Frequency response:
    DC- 35 kHz (40Vr.m.s. output SR-207, when using one unit)
    Rated input level:
    125 mV with 100V output
    Maximum input level:
    30 V r.m.s. with volume at minimum setting
    58 dB (x800)
    Total harmonic distortion:
    max. 0.01% (1 kHz / during 100 V r.m.s. output) 
    Input impedance:
    50 kΩ (RCA) 
    Maximum output voltage:
    280 V r.m.s. / 1 kHz 
    Standard bias voltage:
    DC580 V (PRO bias)
    Power consumption:
    DC12V, 4W/ Exclusive AC adaptor attached For your area
    Temperature range for use:
    Between 0º and 35ºC, max. 90% (no condensation)
    External dimensions:
    132 (W) × 38 (H) × 132 (D) mm (without Knob, Pin jack)
  • Warranty

    Don’t sweat it, This Stax product is covered by a 1 Year manufacturer's warranty.
    Learn more

  • Frequently Asked Questions

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