HC-X1500 hissing sound from mic terminal in audio
Using the HC-X1500, there is a clear hissing sound in the audio when an external audio source is plugged in through the 3.5mm mic terminal. This is not a sound coming from the mic, but a sound that comes from the camera. Listening to the audio that comes from the camera with headphones, the audio from the onboard microphone sounds fine. When I plug any 3.5 jack into the mic input, microphone on or off, there is an instant hiss that can be heard that is far louder than any white noise coming from the camera. When the microphone is turned on, the hiss is not made louder at all. This his is also present when there is nothing attached to the end of the cable as well. I have tried different microphones, different cables, different gain settings with no change in the hiss.
Is this something that has been experienced by others who use this camera or its sibling camcorders?