MD: Plug'n'power mics

Hello, what does it Plug in Power Mic input mean on the Sony's portable MDs? I've already have mono mic Sony ECM-F8 microphone, powered by its own battery, but am I wrong thinking than I don't need it at all because mic get the power from the unit itself? Is this feature reserved for stereo

Re: MD: Plug'n'power mics

=== = NB: Over 50% of this message is QUOTED, please = = be more selective when quoting text = === Plug in power means the recorder will provide