The MI-3170 is a single power drive (constant current drive) from the SR-2210.

The MI-3170 can output voltages of 2V or more from the ground and 2V or less from the current voltage.

The applied voltage of SR-2210 is 18V, so the upper limit of the amplitude voltage is 16V which is 2V lower than the applied voltage.

The original output voltage range of the MI-3170 is ±8V, so the output voltage in the calculation is as follows;

However, the voltage is limited to 2V or less of the applied voltage when using the SR-2210, so upper limit of the output voltage is +16V.

The calculate the measurable maximum sound pressure level in the stationary sine wave with the MI-1271 microphone sensitivity -26 dB (1V/Pa);

When the DC bias voltage is 12V,
The upper limit of the voltage output is 16V, so the amplitude of one side is limited to 4V (16-12). Which means that the measurable voltage is ±4V. The rms value and dB value of ±4V are 2.82Vrms and 9dBVrms.

The calculation formula to give an allowance up to the measurable 9 dBVrms: 9-(-26)=35 dB

In the same way,
When the DC bias voltage is 10 V, ±6V (4.24 Vrms/ 12.6 dBVrms)

When the DC bias voltage is 14 V, ±2 V (1.41 Vrms/3.01 dBVrms)

https://www.onosokki.co.jp/English/hp_e/c_support/faq/mi/mi8100_2.htm

　
From the (1) formula in the above FAQ; SR2210: Gain 0dB, insertion loss of preamplifier: 0 dB, reference sound pressure level: 94 dB 
When calculate it with the microphone sensitivity 50 (mV/Pa); 1.41 V/(50 mV/Pa)=28.2 Pa Reference sound pressure is 20µPa; the measurable sound pressure level is 123 dB from 20 Log (28.2 Pa/ 20µPa)

-Remarks-　
When using the MI-1235/1433

When calculating with the microphone sensitivity of -29 dB;

94 dB-(-29 dB)+3 dB=126 dB (*94 dB is the reference sound pressure level)

When calculating with the microphone sensitivity: 36 (mV/Pa)
1.41 V/(36 mV/Pa)=39.2 Pa
The reference sensitivity is 20µPa, so 20 Log (39.2 Pa/20µPa)=126 dB

*Please refer to this page for the MI-3170.

*Please refer to this page for the SR-2210.