Stax SRS-3100 Earspeaker System


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Electrostatic Earspeaker System

The SR-L300 earspeaker employs new hand selected thin film diaphragm and tough stainless fixed electrodes. Rich deep bass response, delicate high frequency and soothing mid-range has been achieved in a balanced manner.

The SRM-252S is an exclusive driver unit (amplifier) for driving STAX ear speakers with PRO-bias 5 pins. Its line input can directly connect to the audio output terminal of CD player, portable audio player or DAC. The SRM-252S has a simple design that excels in sound quality employing the carefully selected newest high-voltage transistors and low-noise FETs. The output stage featuring the emitter-follower configuration reinforces the driving performance and also realised the smooth sound quality. Moreover, the class-A amplification throughout the stages with no coupling capacitors reproduces exhaustively the finest nuance of music.

Although the SRM-252S includes a class-A DC amplifier in a compact CD jacket size case, the internal heat is effectively dissipated through the chassis of aluminium extrusion material to improve the reliability over a long period of time. Also, the parallel output terminal was added to distribute the source signal so that a loud speaker may also be simultaneously used when source equipment has only a pair of output terminals.



  • Type: Push-Pull electrostatic oval sound element, Open-Air type enclosure
  • Frequency response: 7 – 41,000Hz
  • Electrostatic capacitance: 110pF (including attached code)
  • Impedance: 145kΩ (including attached cable, at 10kHz)
  • Sound pressure sensitivity: 101dB / input 100Vr.m.s. / 1kHz
  • Bias voltage: 580V DC
  • Ear pad: high-quality artificial leather (for SR-L300 only)
  • Cable: parallel 6-strand, 2.5m full length, low-capacity special wide OFC cable
  • Weight : 448g (including attached cable), 322g (without cable)
  • Right/left channel indication: 'L' and 'R' indicated on the arc assembly (inside head spring), solid line (left) and dotted line (right) on cable


    • Type: All-stage semiconductors, Low-noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
    • Frequency Response: DC to 35,000Hz with SR-207 (with SR-207)
    • High Harmonic Distortion: Max 0.01% (1kHz at 100V r.m.s. )
    • Gain: 58dB (x800)
    • Input Terminal: 1 RCA with 1 RCA parallel out
    • Rated Input Level: 125mV / 100V Outputs
    • Max. Input Level: 30V (at minimum volume level)
    • Input Impedance: 50KΩ(RCA)
    • Max. Output Voltage: 280V r.m.s. (1kHz)
    • Standard Bias Voltage: PRO 580V x 1
    • Power Voltage Frequency: 117V (50Hz / 60Hz)
    • Power Consumption: 4W DC12V
    • Temperature & Humidity: 0 to 35ºC / 90% max. without condensation
    • Dimensions: 5.2 (W) x 1.5 (H) x 5.2 (D) in
    • Weight: 0.5kg
    • Color: Silver