Cardioid Condenser Microphone


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The AT4051a has been discontinued. The AT4051b is a similar model, click here for more information. Ideal for professional recording and critical applications in broadcast, this 40 Series cardioid condenser microphone consists of the AT4900a-48 body with the AT4051a-EL cardioid element. This versatile studio performer may be used with confidence in a wide variety of professional miking applications, even under the stringent demands of modern digital recording systems. Featuring direct-coupled balanced outputs for clean signals in high-output conditions, the microphone is totally free of the distortion associated with conventional transformer-coupled outputs. And its fast response to transients contributes to the open, transparent reproduction of even the most difficult-to-capture instruments.


  • Direct-coupled, balanced output ensures a clean signal even in high-output conditions
  • Exceptionally low self-noise, very high output and fast transient response
  • Accepts optional interchangeable capsules: AT4049a-EL (omnidirectional) and AT4053a-EL (hypercardioid)
  • Switchable 80 Hz hi-pass filter
  • Turned-brass microphone housing with black chrome plating
  • The AT4051a consists of two modular subassemblies: an AT4900a-48 body and an AT4051a-EL head capsule (both available separately)


Element Externally polarized (DC bias) condenser
Polar Pattern Cardioid
Frequency Response 20-20,000 Hz
Low Frequency Roll Off 80 Hz, 12 dB/octave
Open Circuit Sensitivity -34 dB (19.9 mV) re 1V at 1 Pa
Maximum Input Sound Level 146 dB SPL, 1 kHz at 1% T.H.D.
Noise 19 dB SPL
Dynamic Range 127 dB, 1 kHz at Max SPL
Signal-to-Noise Ratio 75 dB, 1 kHz at 1 Pa
Phantom Power Requirements 48V DC, 3.2 mA typical
Switches Flat, roll-off
Weight 4.2 oz (120 g)
Dimensions 6.10" (155.0 mm) long, 0.83" (21.0 mm) body diameter
Output Connector Integral 3-pin XLRM-type
Optional Interchangeable Elements AT4049a-EL (omnidirectional); AT4053a-EL (hypercardioid)
Accessories Included AT8405a stand clamp for 5/8"-27 threaded stands; AT8159 windscreen; protective carrying case
Audio-Technica Case Style S1


AT4051a Specification Sheet