There are definitely bats that produce chirps (partially) in the human-audible range. You don't need above-average hearing to notice 15 kHz sounds, which appear

There are definitely bats that produce chirps (partially) in the human-audible range. You don't need above-average hearing to notice 15 kHz sounds, which appears to be the lower end listed in some source. Most echolocation happens way beyond human hearing range though.