I would like to know where I can find the specs for the microphones in the Astra. I would like to use these mics to detect fire alarms which have these characteristics:
Sound (audible signals)
~3 kHz / ~3100 Hz tone (high frequency). Used in many current notification devices.
520 Hz (low frequency). Used in newer notification devices.
45 dB to 120 dB A weighted for human hearing (higher decibels, in the 100 to 120 dB range, were common with older fire alarm horns)