Panasonic BB-HCM331A - Manual (Page 29)

Operating Instructions
29 [For assistance, please call: 1-800-272-7033]
• The external microphone input terminal does not correspond to an line level.
Audio may be distorted when the line level is input. Audio distortion will be
solved if you insert the following circuits. Under no circumstance should high
level audio, such as from a speaker, be connected to this input terminal. Doing
so is likely to damage the camera.
Camera
External Microphone
Input Terminal
Audio Line
Out
Capacitor Resister
1 F 33 K