SoundCraft SPIRIT POWERSTATION, Руководство пользователя

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If the signal level is too low it may be masked
by the noise.
Signal
Noise
If the signal level is too high, clipping distortion
may occur.
Clipped
Signal
Noise
A mixer is often judged, amongst other factors, by the amount
of Headroom available. This is a measure of the reserve
available to cope with sudden peaks in the input signal,
without distortion caused by Clipping, when the signal
becomes so high that it would exceed the power supply rail
voltages and is as a result limited. This commonly occurs
where gain settings are incorrectly set or where sources are
improperly matched to the mixer input. If the source signal is
too high, clipping and distortion results. If the signal is too
low it becomes masked by the background noise which is
present to some degree in all mixers. The diagram below
illustrates this point.
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