Model: HT378B02

$1,150.00 USD
(Pricing valid in US only)


377B02 microphone and HT426E01 preamplifier, TEDS programmed

This model includes a 1/2" microphone cartridge, a mated preamplifier with TEDS, and system calibration. Click the following for individual component information.

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Free-Field
  • Frequency Range: (±2dB) 3.5 to 20000 Hz (3.5 to 20000 Hz)
  • Dynamic Range: 138.5 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response Characteristic (at 0° incidence)Free-FieldFree-Field 
Sensitivity50 mV/Pa50 mV/Pa[3] 
Sensitivity (±1.5 dB)-26 dB re 1 V/Pa-26 dB re 1 V/Pa[3] 
Frequency Range (±2 dB)3.5 to 20000 Hz3.5 to 20000 Hz 
Frequency Range (±1 dB)6 to 10000 Hz6 to 10000 Hz 
Lower Limiting Frequency (3 dB)1.0 to 2.75 Hz1.0 to 2.75 Hz 
Inherent Noise16 dB(A) re 20 µPa16 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)138.5 dB re 20 µPa138.5 dB re 20 µPa[1] 
TEDS CompliantYesYes[2] 
Temperature Range (Operating)-40 to +257 °F-40 to +125 °C[4] 
Temperature Coefficient of Sensitivity (+14 to +158°F (-10 to +70°C))0.005 dB/°F0.009 dB/°C[1][3] 
Static Pressure Coefficient-0.013 dB/kPa-0.013 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[5] 
Excitation Voltage20 to 32 VDC20 to 32 VDC 
Constant Current Excitation2 to 10 mA2 to 10 mA 
Output Bias Voltage10 to 14 VDC10 to 14 VDC 
Maximum Output Voltage±7 Vpk±7 Vpk 
Output Impedance<55 Ohm<55 Ohm 
Housing MaterialStainless AlloyStainless Alloy 
Electrical ConnectorBNC JackBNC Jack 
Mounting Thread (Grid)0.5 - 60 UNS0.5 - 60 UNS 
Size - Diameter (with grid).52 in13.2 mm 
Size - Diameter (without grid).50 in12.7 mm 
Size - Height (with grid)3.88 in98.6 mm 
Size - Height (without grid)3.84 in97.5 mm 
Weight1.74 oz49.2 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] Limited to 120°C if ICP current > 4 mA
[5] Prepolarized
[6] Venting through Preamp.
[7] See PCB Declaration of Conformance PS065 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

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