Or the fat woman who had the words 'think thin' played back all day just below the audible level.

The threshold is the mean of the just audible and just inaudible levels.

A small amplifier is often necessary to bring the guitar up to audible level.

Honey's coo turned into soft melodic sounds, hovering just above audible level.

A low growl came from inside, never rising to much more than a barely audible level, but enough for the dog to understand and fear.

I want you to-' Her whisper fell below an audible level.

Steward dropped his voice to a barely audible level.

A series of whistles, grunts, and squeaks often rising above audible level.

The sound volume automatically went down to a barely audible level.

A small sound, just at the audible level, came to her ears.