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While accurate stereo imaging forms the basis for the art of stereo
recording, there is one technique in use today, that does not produce
an accurate ambient stereo image. This involves the use of "shotgun" mics.
A shotgun mic has a very directional pickup pattern. The pick up pattern
or polar pattern is the area of space that the microphone will "hear".
The pickup pattern on a shotgun mic is a narrow , forward facing lobe.
This allows the microphone to only pick up or hear what it is "pointed"
at. The shotgun or "spot mic" as it is sometimes called, is the only
mic you can point at a sound source. Any other mic requires consideration
of its polar pattern during placement for a stereo recording. The results
obtained thru the use of shotgun mics are satisfying only when recording
a directional sound source (like a PA system) or when highlighting a specific
sound, like a bird call, in an ambient recording. When recording a PA system,
they produce stereo in the same way a direct feed would, with amplitude
differences between channels.
The best results are obtained when using hybrid
shotguns like the AKG line, which are less directional at low frequencies.
This characteristic produces a recording with high isolation of ambient
sounds , like crowd response and spatial information , yet is less colored
and more natural sounding to the ear. They are best used as spot mics when
high isolation is required.
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