dh-sd29204t-gn

I own 7 Dahua cameras which include 5 IPC-HDW4431C-A cams and 1 Starlight IPC-HDW4231EM-AS and the audio problem child in the title. All but this camera have very usable audio. This camera has lots of noise. By noise I mean crackling and squeal (sounds like feedback). I've tried every available...