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Model: 378A12

$1,350.00 USD
(Pricing valid in US only)


1/4-inch pressure prepolarized 377A12 microphone, with 1/4-inch preamplifier 426B03 and TEDS programmed

  • Nominal Microphone Diameter: 1/4"
  • Frequency Response Characteristic: Pressure
  • Frequency Range: (±2dB) 5 to 20000 Hz (5 to 20000 Hz)
  • Dynamic Range: 182 dB re 20 µPa

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Nominal Microphone Diameter1/4"1/4" 
Frequency Response CharacteristicPressurePressure 
Sensitivity0.25 mV/Pa0.25 mV/Pa[3] 
Sensitivity (±3 dB)-72 dB re 1 V/Pa-72 dB re 1 V/Pa[3] 
Frequency Range (±2 dB)5 to 20000 Hz5 to 20000 Hz 
Lower Limiting Frequency (-3 dB)0.75 to 4.0 Hz0.75 to 4.0 Hz 
Inherent Noise60 dB(A) re 20 µPa60 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)182 dB re 20 µPa182 dB re 20 µPa[1] 
Maximum Sound Pressure Level(Peak)>194 dB re 20 µPa>194 dB re 20 µPa 
TEDS CompliantYesYes[2] 
Temperature Range (Operating)-40 to +158 °F-40 to +70 °C 
Temperature Coefficient of Sensitivity (+14 to +158°F (-10 to +70°C))0.004 dB/°F0.007 dB/°C[1][3] 
Static Pressure Coefficient-0.001 dB/kPa-0.001 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))72 dB re 20 µPa72 dB re 20 µPa[1] 
Polarization Voltage0 V0 V[4] 
Excitation Voltage20 to 32 VDC20 to 32 VDC 
Constant Current Excitation2 to 20 mA2 to 20 mA 
Output Bias Voltage10 to 14 VDC10 to 14 VDC 
Maximum Output Voltage±8 Vpk±8 Vpk 
Output Impedance<50 Ohm<50 Ohm 
Housing MaterialStainless AlloyStainless Alloy 
Electrical Connector10-32 Jack10-32 Jack 
Mounting Thread (Grid)0.25 - 60 UNS0.25 - 60 UNS 
Size - Diameter (with grid)0.28 in7.1 mm 
Size - Diameter (without grid)0.25 6.34 mm 
Size - Height (with grid)2.07 in52.6 mm 
Size - Height (without grid)2.02 in51.3 mm 
Weight0.27 oz7.8 gm[1] 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] TEDS Capable Digital Memory and Communication, compliant with IEEE 1451.4
[3] re 250 Hz
[4] Prepolarized
[5] Venting through Preamp.
[6] See PCB Declaration of Conformance PS076 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
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones