Fastest rate at which an amplifier can change the amplitude of its output signal measured in volts per microsecond with a higher figure being better (meaning that the amplifier can change more voltage in a given period of time, one microsecond). An amplifier with a good slew rate can quickly alter the amplitude, or power/volume, of a signal. This is an important characteristic for reproducing sudden, extreme changes in a signal such as those developed with an explosion or similar loud, powerful, sudden sound. Slew rate is the response rate to an increase in amplitude.