subaudible
/ˌsʌbˈɔː.də.bəl/
adjective
- Too quiet or low in frequency to be heard clearly by the human ear.
- Some animals communicate using subaudible sounds that are below our hearing range.
- The dog reacted to a subaudible whistle that humans couldn't hear.
- The recording contained subaudible background noise that had to be filtered out.
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