The SM93 is an economical omnidirectional miniature lavalier condenser microphone designed for use in speech applications. Despite its small size, the microphone element provides full, clear sound comparable to that of much larger microphones. Its frequency response is tailored to body-worn applications, with low-end rolloff and presence rise. 

The SM93 is powered by phantom power supplied by broadcast, sound reinforcement or recording equipment, or an external phantom supply. The SM93 operates over an extremely wide voltage range of 11 to 52 Vdc, covering both DIN and IEC phantom power standards.

The SM93 is supplied with a sew-on mounting bracket, a mounting block with attached tie bar, and an acoustic windscreen to minimize wind noise in outdoor applications. It is also supplied with a dual mounting block with attached tie bar.

  • Subminiature lavalier design; ideal size for theater, television broadcasting, video, film, and sound reinforcement
  • Small, inconspicuous mounting hardware
  • Full, clear sound comparable to larger microphones
  • Smooth extended frequency response with presence rise specially tailored for chest-worn microphone operation
  • Controlled low-frequency rolloff reduces low-frequency clothing and room noise
  • Low distortion, wide dynamic range
  • Versatile mounting accessories allow a variety of low-visibility applications
  • Preamplifier assembly can be pocketed, strapped to the body, or clipped to belt or waistband
  • Omnidirectional condenser
  • Frequency response: 80 to 20,000 Hz


  • Type
    • Condenser (electret bias)
  • Frequency Response (Figure 4)
    • 80 to 20,000 Hz, 12 dB/octave rolloff below 100 Hz
  • Polar Pattern
    • Omnidirectional, uniform with frequency
  • Output Impedance
    • Rated at 150 Ω (90 Ω actual) Recommended minimum load impedance: 800 Ω (May be used with loads as low as 150 Ω with reduced clipping level)
  • Output Level
    • Open Circuit Voltage: –43 dBV/Pa (7.0 mV)
  • Output Clipping Level (at 1,000 Hz)
    • –18 dBV (0.13 V) minimum
  • Total Harmonic Distortion
    • Less than 1% at 120 dB
  • Maximum
    • SPL 120
  • Dynamic Range (maximum SPL to A-weighted noise level) 1
    • 98 dB
  • Output Noise (equivalent SPL)
    • 22 dB typical, A-weighted
    • 26 dB, weighted per DIN 45 405
  • Hum Pickup (electromagnetic)
    • –4 dB equivalent SPL in a 1 mOe field (60 Hz)
  • Signal-to-Noise Ratio
    • 72 dB at 94 dB SPL (IEC 651)
  • Polarity
    • Positive pressure on microphone diaphragm produces positive voltage on pin 2 relative to pin 3 of preamplifier output cable connector.
  • Recommended Operating Voltage
    • 11 to 52 Vdc phantom. Protected against reverse voltage application
  • Current Drain
    • 33 mA
  • Environmental Conditions
    • Operating Temperatures: –18o to 57o C (0o to 135o F)
    • Storage Temperatures:–29o to 74o C (-20o to 165o F)
  • Cable
    • Black 1.27 m (4.17 ft), attached, two-conductor, shielded, terminated by miniature connector type (TA4F)
  • Case
    • Microphone: Black ABS thermoplastic case with stainless-steel-mesh grille Preamplifier: Steel case with non-reflective black finish, black-chrome belt clip
  • Net Weight
    • Microphone:16 g (0.57 oz) Preamplifier:118 g (4.17 oz)