Microphone Preamplifiers
Microphones & AccessoriesWe offer a range of microphone preamplifiers which are suitable with both Class 1 and Class 2 microphone capsules.
Microphone Preamplifiers
MV:220A 1/2” Prepolarised Microphone Preamplifier
The MV:220A 1/2-inch Preamplifier is a general purpose preamplifier suitable for use with prepolarised measurement microphone capsules.
It is a small unit with a slimline profile and is powered via the coaxial BNC-type connector. Power is from a suitable constant-current source of typically 4mA with a power supply excitation voltage of between 15v and 24v DC.
The frequency response (-3dB points) of the MV:220A are 2.6Hz to 150kHz.
The MV:220A can be used with the Cirrus Research Class+ Microphone Capsules including:
- MK:224 Class 1 Microphone Capsule
- MK:216 Class 2 Microphone Capsule
Please note that this information is in relation to the MV:220A 1/2” Prepolarised Microphone Preamplifier
Frequency Response
0.1dB at 16Hz and 20kHz
3dB at 2.6Hz and 150kHz
Input Impedance
1200 MΩ
Output Impedance
50 Ohms
Gain
14.8dB (5.5x) with 18pF Microphone Capsule
Noise Floor
A-weighted: < 45dB
Dimensions
Length: 98mm
Diameter: Ø13mm
Power Supply
Excitation Voltage: 17 to 25 VDC
Constant Current Excitation: 4mA
Output bias voltage: 10VDC
Polarisation Voltage
None
Output Voltage
Maximum output signal voltage: 1V RMS (2.82V Pk-Pk)
Maximum signal input (with 40mV/Pa mic.capsule): 140dB
Maximum Cable Length
100 meters
Connection Input: 1/2” Microphone 60 UNS
Output: Coaxial BNC
Startup stabilisation time
15 seconds
Temperature
Operation: -10oCto +50oC
Storage: -20oC to +60oC
