I'm evaluating two different high sensitivity, low frequency microphones from the same manufacturer. They are the same part with a differing internal capacitor, but I'm not provided an internal schematic so I'm not sure what the drawing/datasheet means by internal capacitor, and how that affects my project.
The following part has an internal capacitor listed as 33pF:
While this part has an internal capacitor of 10pF:
Are these connected across the microphone contacts, or elsewhere in the internal microphone amplifier? Or is it descriptive of a microphone parameter rather than an additional component part of the microphone?
I'm looking to measure low amplitude, low frequency sounds (5Hz-100Hz). What will I find different in practice between the two microphones for this purpose?