Some digital limiters aren’t configured, out of the box, for catching the peaks that might occur between digital samples (intersample peaks).
Whichever kind of limiter you have, know that it may not protect against clipping, and your metering might not show the clipping unless it’s designed to display these ‘true peaks’. Sometimes this parameter is off-limits to the user. Sometimes you can tweak how far the limiter peers into the distance with a dedicated lookahead parameter. These limiters operate with infinitely high ratios, always implementing a delay in the signal in order to see any peaks coming down the pike. Usually the desired ceiling is somewhere between -1 and -0.3 dBFS-the digital ceiling, beyond which you get distortion. We often call such processors “brickwall limiters,” as their implementation keeps the signal from breaking through a predetermined ceiling (maybe we should call them “brick-ceiling limiters”).
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