Maximum Input Level
Maximum input voltage is the largest signal level an input accepts before the stated overload or distortion limit.
The frequency, gain setting and input connection belong to the measurement. It differs from input sensitivity, which describes the level needed for a specified output.
Maximum Input Level — MC Head Amp
For a phono head amp, this rating describes the cartridge-signal level tolerated by the input, commonly in millivolts. Available overload margin can differ with gain and frequency.
Compare the same gain and test frequency, retaining any stated bound. A recommended cartridge-output range is a different specification. A margin in decibels needs its reference level and should not be read as an input voltage.
Maximum Input Level — Crossover
For an active crossover, the maximum describes the signal level accepted by the specified input path. Exceeding its limit can overload the input before the downstream amplifiers reach their own limits.
Compare input connector, gain configuration and distortion criterion with the source’s output level. Keep RMS, peak and peak-to-peak voltage conventions consistent. Output headroom does not by itself establish input tolerance.
Maximum Input Level — Equalizer
For an equalizer, maximum input voltage describes the input stage’s signal ceiling under the stated setup. Gain and equalization settings can also affect available headroom elsewhere in the unit.
Compare the same input connection and test conditions. A nominal operating level or input-sensitivity figure is not the overload ceiling. Large boosts may require additional headroom even when the incoming signal is within the stated input limit.