Isolation Shields: 5 Fast Facts

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Fact #1. Microphones amplify any sound that goes into them, but that can include unwanted audio from around the room. Audiences of live performances expect to hear some ambient noise, but when someone purchases a CD or a recorded version of a performance, they usually want clean and clear sound.
Fact #2. Isolation shields allow performers to deliver studio-quality sound outside of the controlled environment of a recording room. This device is placed behind a microphone and blocks out any extra sound to help produce sharper vocals. They're also used in the recording of guitars, bass, and drums, as well.
Fact #3. Isolation shields are typically internally padded with acoustic foam similar to the noise blocking variety you find on the walls of a recording studio. The foam works to absorb ambient noise before it reaches the very sensitive microphone. Most models have hard outer shells that trap the sound the user wants to record inside of the shield and eliminates any echoes.
Fact #4. Isolation shields are usually molded into a shape that reduces sound reflections. They're slightly vented, allowing the microphone to breathe. If the shields were not vented, the result could be a sound that was too harsh on the listener's ears.
Fact #5. Most shields have angle adjustability. The user can move them according to where the unwanted sound is coming from. In any live studio environment, like a concert, the direction from where the ambient noise is coming is unpredictable. The performer may need to block it out on the left, right, or even slightly above them. Some have three panels, creating a miniature room, so the user can be almost totally isolated. These are best for events like horse races or Nascar, where people don't need to see the orator.