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I have a Lorex NVR N861 series. On the back are two RCA jacks . The top one is labeled out and the bottom is labeded in. In the manual it shows a picture of speakers plugged into the out jack and a microphone plugged into the in jack. I tried hooking up two different self powered computer speakers to the out jack and got very low audio through the speakers with the volume turned up all the way. What i am trying to do is hear the sounds picked up from a selected camera and also being able to talk through a camera outside with a microphone from my nvr desk position. what do i need to get this going.

I have a Lorex NVR series N861. On the back are two rca jacks for audio in and audio out. All my cameras have built in audio. What i want to do is hook a microphone to the NVR where i can speak into it and have my voice come out of the cameras.. It says in the manual something about a self powered microphone. Not sure what i need to do. Does anyone know where i can get a microphone that will work with this NVR and how do i hook it up. The microphone will be right next ot the DVR.