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If your Web conference focuses only one one speaker, a regular head set microphone plugged into your PC's "MIC IN" port will do just fine. However, if the conference call is more than two people then you will need an Omni-directional microphone. This type of microphone picks up audio in a circular direction and can cover a distance of 10 ft by 5 ft. Any rooms larger then this will require additional microphones to be set up.
What microphone do you recommend to pick up questions and discussion from the participants in the room? If there are 25 participants in the room and some online, what microphone works best to connect to the computer so the online participants can hear what the discussion is about in the room?