Hi. I've read the IPVM "Audio for Surveillance Systems Tutorial" and am curious as to what others have experienced using the built-in microphones that come with standard cameras. I'm not expecting Hi-Fidelity sound or CD quality, but was more interested in the coverage distance.
I'm looking at an existing Hanwha QND-6070R (or maybe the 7070R) and the spec for audio is this: Selectable (Built-in microphone), Supported voltage: 2.5VDC (4mA), Input impedance: 2K Ohm.
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