Model: 426A11

$750.00 USD
(Pricing valid in US only)


1/2-inch ICP® preamplifier with gain and filter switches (for prepolarized microphones)

ICP(R) low noise preamplifier with gain, filters, and TEDS

  • Nominal Microphone Diameter: 1/2"
  • Temperature Range: -4 to +158 °F (-20 to +70 °C)
  • Output Voltage: 5 Vpk
  • Size - Length: 4.25 in (108.0 mm)

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Nominal Microphone Diameter1/2"1/2" 
Gain (re 1 kHz)-0.16 dB-0.16 dB[1][3] 
Filter Type (3-pole Butterworth)High PassHigh Pass[5] 
Electrical Filter Corner Frequency20 Hz20 Hz[1] 
Filter TypeA-weightA-weight[4][5] 
Frequency Response (±0.2 dB)5 to 125000 Hz5 to 125000 Hz[6][8] 
Frequency Response (±1.6 dB) (A-weight Filter Engaged)12.6 to 20000 Hz12.6 to 20000 Hz[6][8] 
Frequency Response (±1.0 dB) (A-weight Filter Engaged)20 to 10000 Hz20 to 10000 Hz[1][8] 
Frequency Response (±0.3 dB) (+20 dB Gain)4 to 25000 Hz4 to 25000 Hz[8] 
Phase Linearity (-3 to +10 °)5 to 20 Hz5 to 20 Hz[3][9] 
Phase Linearity (±3 °)20 to 20000 Hz20 to 20000 Hz[3][9] 
Electrical Noise (A Weight, 0 dB Gain)<7.5 µV<7.5 µV[3][7] 
Electrical Noise (A Weight, 0 dB Gain)5 µV5 µV[1][3][7] 
Electrical Noise (0 dB Gain)<5.7 µV<5.7 µV[3][7] 
Electrical Noise (0 dB Gain)4.2 µV4.2 µV[1][3][7] 
Electrical Noise (+20 dB Gain)<60 µV<60 µV[3][7] 
Electrical Noise (+20 dB Gain)40 µV40 µV[1][3][7] 
Electrical Noise (High Pass Filter, 0 dB Gain)<5.6 µV<5.6 µV[3][7] 
Electrical Noise (High Pass Filter, 0 dB Gain)3.7 µV3.7 µV[1][3][7] 
Distortion (5 V pk output at 1 kHz)<-60 dB<-60 dB[3] 
Output Slew Rate2 V/µS2 V/µS[1] 
TEDS CompliantYesYes[2] 
Temperature Range (Operating)-4 to +158 °F-20 to +70 °C 
Temperature Response<0.05 dB<0.05 dB 
Humidity Range (Non-Condensing)0 to 95 %RH0 to 95 %RH 
Humidity Sensitivity<0.05 dB<0.05 dB 
Excitation Voltage22 to 34 VDC22 to 34 VDC 
Constant Current Excitation4 to 20 mA4 to 20 mA 
Impedance (Input)10 GOhm10 GOhm[1] 
Capacitance (Input)0.28 pF0.28 pF[1] 
Output Bias Voltage15 VDC15 VDC[1] 
Maximum Input Voltage (0 dB gain)5 Vpk5 Vpk[5] 
Maximum Input Voltage (+20 dB gain)0.5 Vpk0.5 Vpk[5] 
Impedance (at 1 kHz ) (Output)<50 Ohm<50 Ohm 
Output Voltage (Maximum)5 Vpk5 Vpk 
Housing MaterialStainless SteelStainless Steel 
Size - Diameter0.5 in12.7 mm 
Size - Length4.25 in108.0 mm 
Weight1.5 oz43.7 gm 
Electrical ConnectorBNC JackBNC Jack 
Mounting Thread (Microphone to Preamplifier)0.4606 - 60 UNS11.7 mm - 60 UNS 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] TEDS Capable Digital Memory and Communication, compliant with IEEE P1451.4
[3] Measured with an 18 pF reference microphone.
[4] Per IEC 61672-1:2002 "Sound Level Meters" Class 1
[5] Overload detection is in front of filters. Positive pulses at output indicate overload.
[6] Error from ideal A weight re 1 kHz.
[7] 20 Hz to 20 kHz
[8] re 1 kHz
[9] Without Filter or +20 dB gain engaged.
[10] See PCB Declaration of Conformance PS074 for details.
ERC-16Calibration of microphone preamplifier(1)
Optional Versions:
No optional versions
Product Documents
Additional Downloads
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones