noun
a type of sound distortion that occurs when sound from a speaker is picked up by a microphone and then re-amplified, creating a loop of sound
adjective
related to the characteristics of sound, particularly in terms of how it is produced and transmitted
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The acoustical feedback from the microphone caused a high-pitched squeal during the presentation.
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The acoustical feedback was so annoying during the concert, it hurt my ears!
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The acoustical feedback was like nails on a chalkboard, dude.
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The acoustical feedback in their relationship was a constant source of tension and miscommunication.