I've soldered EM172 microphones to BNC connectors to get data from them.

Then I've build an amplifier for them. The circuit is

I've build 6 such circuits inside 1 box. It needs +15 V to A3 and GND to A2. A1 power channel is not used.

LISO model for this scheme was created and simulation results were compared to measurement of each channel

Measured noise curve (green) is the SR785 own noise.