Please be informed that we have reviewed and revised the specification notation of MI-1531.
Previously, the performances of the microphone alone were described in the specifications of the MI-1531. However, since this product is used in combination with the preamplifier MI-3140, we have revised the specifications to reflect when used in combination with the MI-3140 as the official description to avoid misunderstanding.
In addition, there was an error in the description of the attenuation in the specifications of the preamplifier MI-3140, thus we have also corrected it.
We sincerely apologize for any inconvenience caused.
Revised specifications
For detailed specifications, please refer to the product homepage.
MI-1531 1/4-inch back electrets type Microphone
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Before revision
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After revision
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Frequency range
(250 Hz as reference)
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without protection grid :
10 Hz to 40 kHz (±1 dB)
10 Hz to 100 kHz (+2 dB, -4 dB)
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without protection grid :
10 Hz to 40 kHz (±2 dB)
10 Hz to 100 kHz (+2 dB, -4 dB)
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Maximum sound pressure
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166 dB
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157 dB (when using MI-3140)
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Self-noise level
(A-weighting)
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30 dB
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37 dB (Typ. Value) (when using MI-3140)
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Operating temperature range
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-40 °C to +150 °C
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-30 °C to +60 °C (when using MI-3140)
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Correction of error
MI-3140 Preamplifier for 1/4-inch back-electret type microphone
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Before revision
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After revision
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| Attenuation |
0.25 dB (Typ. value)
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0.35 dB (Typ. value)
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