Model: 378A04

$2,450.00 USD
(Pricing valid in US only)



This model includes a 1/2" microphone cartridge, a mated preamplifier with TEDS, and system calibration.

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Free-Field
  • Frequency Range: (±4dB) 5 to 20000 Hz
  • Inherent Noise: 5.5 dB(A) re 20 µPa
  • Dynamic Range: (3% Distortion Limit) >80 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response Characteristic (at 0° incidence)Free-FieldFree-Field 
Sensitivity (±2 dB)-7 dB re 1 V/Pa-7 dB re 1 V/Pa[2] 
Sensitivity450 mV/Pa450 mV/Pa[2] 
Frequency Range (±4 dB)5 to 20000 Hz5 to 20000 Hz 
Frequency Range (±2 dB)10 to 16000 Hz10 to 16000 Hz 
Lower Limiting Frequency (-3 dB)2 to 5 Hz2 to 5 Hz 
Inherent Noise5.5 dB(A) re 20 µPa5.5 dB(A) re 20 µPa[1] 
Inherent Noise<6.5 dB(A) re 20 µPa<6.5 dB(A) re 20 µPa 
Dynamic Range(3% Distortion Limit)>80 dB re 20 µPa>80 dB re 20 µPa[4] 
Dynamic Range(3% Distortion Limit)>100 dB re 20 µPa>100 dB re 20 µPa[5] 
Maximum Sound Pressure Level(Peak)130 dB re 20 µPa130 dB re 20 µPa[1][6] 
TEDS CompliantYesYes[3] 
Temperature Range (Operating)-40 to +176 °F-40 to +80 °C 
Temperature Coefficient of Sensitivity (+14 to +122°F (-10 to +50°C))0.005 dB/°F0.009 dB/°C[1][2] 
Static Pressure Coefficient-0.013 dB/kPa-0.013 dB/kPa[1][2] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)±0.001 dB/%RH±0.001 dB/%RH[2] 
Polarization Voltage0 V0 V[7] 
Excitation Voltage20 to 32 VDC20 to 32 VDC 
Constant Current Excitation4 to 20 mA4 to 20 mA 
Output Bias Voltage12 to 16 VDC12 to 16 VDC 
Maximum Output Voltage±2 Vpk±2 Vpk 
Output Impedance<50 Ohm<50 Ohm 
Housing MaterialStainless AlloyStainless Alloy 
Electrical ConnectorBNC JackBNC Jack 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.50 in12.7 mm[9] 
Size - Height (with grid)4.02 in102.1 mm 
Size - Height (without grid)3.99 in101.2 mm 
Weight1.81 oz51.3 gm[1] 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] re 1 kHz
[3] TEDS Capable Digital Memory and Communication, compliant with IEEE 1451.4
[4] In the total frequency range.
[5] Below 5 kHz
[6] Non-destructive
[7] Prepolarized
[8] Venting through Preamp.
[9] Protection grid permanently affixed to the microphone.
[10] See PCB Declaration of Conformance PS138 for details.
ACS-156Calibration of microphone with preamplifier in an anechoic chamber to include noise floor verification(1)
Optional Versions:
No optional versions
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones

Sound power measurements Part 1

Sound power measurements Part 2