STAX SRM-727Mk2 Headphone Amplifier


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The SRM-727II features non-feedback (NON-NFB) output stage for the first time ever in STAX drivers. Large current emitter follower Class A amplification circuit. This makes it possible to achieve a much more vivid and dynamic sound quality with frequency response raised to 115kHz (from 100kHz).

  • The electrostatic method is a playback method which involves the installation of drive electrodes on either side of a high-polymer film diaphragm with a thickness of only a few microns into each of which a plus signal and a minus signal are fed. This means that XLR connection with a pure balance output CD player makes it possible to listen to the original sound permitted by the balance system without a conversion circuit.    

    • Careful selection of parts with high consideration on sound quality, performance, and the environment. Low noise FET is used at the input stage with a simple two-stage amplifying circuit.
    • SRM-727II provides a bypass mode that enables "direct" connection to preamplifiers, passive volume controls or integrated amplifiers and receivers with Pre-out. A direct switch that avoids duplication of volume control.
    • Type All-stage semiconductors Low noise dual FET input NON-NFB Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
  • Frequency Response: DC to 115,000Hz w/ either SR-007 or SR-404

    High Frequency Distortion: Max. 0.01% (with 100 to 10kHz, 100V r.m.s. output)

    Gain: 54dB (x500)

    Input Terminal: RCA or XLR with 1 RCA parallel out

    Rated Input Level: 200mV (with 100V output)

    Input Impedance: 50Kohm (RCA), 50kohm x2(XLR)

    Max. Output Voltage: 450V r.m.s. (1kHz)

    Standard Bias Voltage: PRO 580V x 2

    Operating Power Voltage Frequency: 117V (50Hz / 60Hz)

    Power Consumption: 46W

    Ambient Temperature & Humidity: 0 to 35ºC / 90% max. without condensation

    External Dimensions: 7.7 (W) x 4.1 (H) x 16.5 (D) in

    Weight: 11.5lbs