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"James Price" wrote in message
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Even though the microphone records sound pressure flat,
you'll find that the sound changes as you move the mic around the room.
Is that a result of room reflections and resonances?

That's one reason. Another major reason is that sound sources (instrument,
speakers, singers, etc.) do not radiate sound uniformly in all directions.
To observe this effect, listen in front of the trumpet section, and then
listen behind them.