Electronic – How to get output voltage of microphone

The key aspects of high-quality microphones include:

• Frequency Response: In many cases flatter is better, but many high-end microphones are selected for particular applications precisely because their responses are not flat. They might have just the right amount of high-end or low-end rolloff, or have a midrange boost in just the right place.
• Pickup Pattern: You have a choice of pickup patterns ranging from omnidirectional, to figure-8, to cardioids and super-cardioids. For the non-omnis, the off-axis frequency response can vary quite a bit from design to design. Again, this makes different microphones better for different situations.
• Sensitivity and Dynamic Range: It's difficult to produce a microphone that has good sensitivity for soft sounds while also having the robustness to handle loud ones. You'll use different models depending on the type of sound you're expecting.
• Noise: Especially if a microphone has an active preamp, the noise floor can become the limiting factor on the dynamic range.
• Physical Robustness: You wouldn't take your best studio microphone and give it to a singer to hand-hold in a live concert.

It would be difficult to achieve good scores in all of these areas with an array of cheap microphone cartidges, for a number of reasons.

The difference between the two mics at low frequency will have virtually nothing to do with the "internal capacitor" - it's value is so small it can't be really expected to have an effect on low frequency performance. For instance a 33pF capacitor at 100 Hz has an impedance of 48 Mohms.

On a wider level, the spec does not seem to contain information about the frequency response of the microphone in both cases - does this not concern you? If I were trying to understand how the mic performed at sub-sonic frequencies I'd want a typical frequency response curve.