Frequently Asked Questions about Microphones

The frequency characteristics (representative values) when measuring the high-frequency range up to 100 kHz with the MI-1531 type microphone and the MI-3140 type dedicated preamplifier, using the SR-2200 type 2ch amplifier (at GAIN-10 setting), are shown in the figure below.
Please note that the upper limit of measurable frequency will vary depending on the magnitude of the sound pressure being measured.

How to read the characteristics table.

The figure shows the frequency characteristics (representative values) of the SR-2200 model 2-channel amplifier when the GAIN setting is -10. Based on the relationship between the input sound pressure and the GAIN setting of the SR-2200, the characteristics can be estimated as in the following examples 1, 2, and 3.

Example 1: The frequency characteristics of the SR-2200 with a GAIN of +10 and an input sound pressure of 130dB are almost equal to the characteristics at an input sound pressure of 140dB shown in the figure.

Example 2: With the SR-2200 set to GAIN+10 and an input sound pressure of 140dB, it is almost equivalent to the characteristics at an input sound pressure of 150dB as shown in the figure.

Example 3: The same considerations can be applied when the GAIN of the SR-2200 is set above +20, but please note that increasing the GAIN can worsen the high-frequency characteristics.

Please see here for SR-2210.