Slew rate is a common specification for transient behavior of electronic devices. It is expressed in V/µs and tells how fast the output of the device rises, given a rapidly rising input. A slew rate of 40V/µs means that it would take one µs for the output to change by 40V. Since studio equipment typically operates on +15V and -15V internally, its output can never really swing 40V. In reality, it might gto 5V in 1/8µs. An audio device will have a maximum slew rate above which it cannot operate. This maximum limits the high-frequency power output of amplifiers and limits the high-level, high-frequency handling capacity in all audio devices. Too low a maximum slew rate results in slew-induced distortion, called transient intermodulation distortion (TIM).