Model: 378C20

$1,195.00 USD
(Pricing valid in US only)


1/2" prepolarized random-incidence condenser microphone, 50 mV/Pa (+/-1.5 dB), with 1/2" ICP® preamplifier

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Random Incidence
  • Frequency Range: (±2dB) 3.75 to 16000 Hz
  • Dynamic Range: 137 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response CharacteristicRandom IncidenceRandom Incidence 
Sensitivity (±1.5 dB)-26 dB re 1 V/Pa-26 dB re 1 V/Pa[3] 
Sensitivity50 mV/Pa50 mV/Pa[3] 
Frequency Range (±2 dB)3.75 to 16000 Hz3.75 to 16000 Hz 
Frequency Range (±1 dB)7 to 6300 Hz7 to 6300 Hz 
Lower Limiting Frequency (3 dB)1.0 to 3.0 Hz1.0 to 3.0  
Inherent Noise16 dB(A) re 20 µPa16 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)137 dB re 20 µPa137 dB re 20 µPa[1] 
TEDS CompliantYesYes[2] 
Temperature Range (Operating)-40 to +176 °F-40 to +80 °C 
Temperature Coefficient of Sensitivity (+14 to +158°F (-10 to +70°C))0.005 dB/°F0.009 dB/°C[1][3] 
Static Pressure Coefficient-0.01 dB/kPa-0.01 dB/kPa[1][3] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)±0.001 dB/%RH±0.001 dB/%RH[3] 
Influence of Axial Vibration (0.1g (1 m/s²))63 dB re 20 µPa63 dB re 20 µPa[1] 
Polarization Voltage0 V0 V[4] 
Excitation Voltage20 to 30 VDC20 to 30 VDC 
Constant Current Excitation2 to 20 mA2 to 20 mA 
Output Bias Voltage10 to 14 VDC10 to 14 VDC 
Maximum Output Voltage±7 Vpk±7 Vpk 
Output Impedance<50 Ohm<50 Ohm 
Housing MaterialStainless AlloyStainless Alloy 
Electrical ConnectorBNC JackBNC Jack 
Mounting Thread (Grid)0.5 - 60 UNS0.5 - 60 UNS 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.50 in12.7 mm 
Size - Height (with grid)3.62 in91.9 mm 
Size - Height (without grid)3.58 in90.9 mm 
Weight1.63 oz45.8 gm[1] 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] TEDS Capable Digital Communication, compliant with IEEE 1451.4
[3] re 250 Hz
[4] Prepolarized
[5] Venting through Preamp.
[6] See PCB Declaration of Conformance PS064 for details.
ACS-63Calibration (with TEDS) of Precision Condenser Microphones and Preamplifiers together (mated pair).(1)
Optional Versions:
No optional versions
Product Documents
Additional Downloads None Listed
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones

Comparison of 1/2" vs 1/4" condenser microphones