See It, Hear It, Feel It: aud; acous (hear; audible)

When it comes to audio technology, we've come a long way from two tin cans and a piece of string. BBC (May 20, 2014)

Peter heard his grandfather shuffle back along the hall to his bedroom, and then the low spark as the television caught, the volume turned down, an agitated news commentator barely audible. Pax

The site converts normally inaudible bat calls into something humans can hear and provides information needed to help visitors identify species. BBC (Oct 3, 2012)

“There’s an audience to whom they do say things,” he said, his voice quickening. New York Times (May 25, 2014)

“Crew read newspapers throughout the flight,” the audit stated, “often with newspapers held up in such a way that if a warning light came on, it would not be noticed.” Outliers

Auditors found problems in several areas, including the overpayments to employees. Washington Post (Feb 26, 2014)

Those kept in the dark could hear softer sounds and there were changes in the structure of the auditory cortex in the brain. BBC (Feb 6, 2014)

Like “The Voice,” “Idol” thrives on the audition process and contestant backstories, so we expect that will be left intact. Forbes (May 22, 2014)

Fifty-two years later, the acoustically vibrant auditorium, with its 30-foot ceiling, is essentially unchanged from the day “Jazz Samba” was recorded. Washington Post

The sound’s not deafening, like with an acoustic kit, but you can hear every thwack and tap on the pad. Leah on the Offbeat

First, Dr. Lee lectured about acoustics, how sounds are produced, echo, and travel. American Spirits