Stereo Condenser Microphone

  • Innovative side-address Mid-Side stereo microphone engineered for professional recording, broadcast and sound reinforcement
  • Independent cardioid and figure-of-eight condenser elements
  • Switch selection of M-S mode and two internally matrixed stereo modes
  • Dual-diaphragm capsules maintain precise polar pattern definition across the full frequency range of the microphone
  • Transformerless circuitry virtually eliminates low-frequency distortion and provides superior correlation of high-speed transients
  • The 2-micron-thick, vapor-deposited gold diaphragms undergo a five-step aging process so that the optimum characteristics remain constant over years of use
  • Open acoustical environment of the symmetrical housing assembly minimizes unwanted internal reflections
  • Custom shock mount provides superior isolation
  • Integral 80 Hz high-pass filter switch and 10 dB pad switch
  • State-of-the-art design and manufacturing techniques ensure compliance with A-T’s stringent consistency and reliability standards

    The AT4050ST is a stereo side-address externally polarized (DC bias) condenser microphone with independent cardioid and figure-of-eight elements configured in a Mid-Side arrangement with switch-selectable internal matrixing. The microphone allows sound recordists the choice of selecting a left-right stereo output (wide 127° or narrow 90°) via the
    microphone’s internal matrixing system or choosing discrete Mid-Side signals for later manipulation. It is designed to meet the most critical acoustic requirements of professional recording, broadcast and sound reinforcement.

    • audio technica AT4050ST
  • AT4050ST Specifications


    Externally-polarized (DC bias) condenser

    Polar Pattern

    Cardioid, Figure-of-eight

    Frequency Response

    20 ~ 18,000 Hz

    Low Frequency Roll-Off

    80 Hz, 12 dB/octave

    Open Circuit Sensitivity

    Stereo, 90º: -42 dB (7.9 mV) re 1V at 1 Pa; Stereo, 127º: -41 dB (8.9 mV), re 1V at 1 Pa;
    Mid: -36 dB (15.8 mV), re 1V at 1 Pa; Side: -36 dB (15.8 mV), re 1V at 1 Pa


    50 Ω

    Maximum Input Sound Level

    149 dB SPL, 1 kHz at 1% T.H.D.;
    159 dB SPL, with 10 dB pad (nominal)


    Stereo, 90º: 25 dB SPL; Stereo, 127º: 26dB SPL;
    Mid: 15 dB SPL; Side: 17 dB SPL

    Dynamic Range (Typical)

    Mid: 134 dB, 1 kHz at Max SPL
    Side: 132 dB, 1 kHz at Max SPL

    Signal-To-Noise Ratio

    Stereo, 90º: 69 dB, 1 kHz at 1 Pa; Stereo, 127º: 78 dB, 1 kHz at 1 Pa;
    Mid: 79 dB, 1 kHz at 1 Pa; Side: 77 dB, 1 kHz at 1 Pa

    Phantom Power

    48V DC, 6.4 mA typical


    90º, 127º, M-S; Flat, roll-off; 10 dB pad (nominal)


    517 g


    53.4mm X 193.0mm (Maximum Diameter X Long)

    Output Connector

    Integral 3-pin XLRM-type

    Output Connector

    Integral 5-pin XLRM-type


    5.0 m long, 8-conductor, shielded, vinyl-jacketed stereo cable with 5-pin XLRF-type connector at microphone end and two 3-pin XLRM-type connectors at output end

    Accessories Furnished

    AT8449 shock mount for ⅝”-27 threaded stands; microphone dust cover; protective carrying case


    audio technica support at4050st_ss.pdf - Operation Manual