The range of input voltages required to produce outputs from the minimum to the maximum output of an amplifier; may also refer to the input sensitivity for maximum output, which is the input in volts required for an amplifier to create its maximum power output. Input sensitivity figures are relatively low being in the area of tenths of a volt for a minimum input (to create the smallest output) and in the area of just a few volts to create a maximum output. Generally, almost all amplifiers are sufficiently sensitive to be driven from their lowest to highest output power levels by almost any preamplifier making input sensitivity a reasonably non-critical part of choosing an amplifier.