At such distances, this is primarily a problem of the acoustic conditions of the surroundings. As the distance between the sound source and the microphone increases, effects such as room geometry, echoes and ambient noise play an increasingly important role.
The MP34DT05TR-A is also an omni-directional microphone, which is equally sensitive to sound from all directions, but this also increases the sensitivity to background noise and thus reduces the useful distances from the desired sound source.
The desired distance of 6 metres is not only determined by the selection of a single microphone, but also by the topology used (e.g. microphone arrays) and the subsequent processing (e.g. beamforming techniques).
However, I fear that the topic is too complex for discussion in the community and recommend discussing it with the local distributors or your local ST contact, if available.
Hope that helps?
Good luck!
/Peter
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