DRC does indeed create some "pre-anti-signal" to correct for the early
reflections; and yes, if you take this too far it's audible. There's
an "insane.drc" in the DRC distribution to show what this sounds like.
The clipping level usually won't change much depending on the strength
of the DRC applied, although it is affected by "flatness" and other EQ
(especially e.g. bass boost).
The more general side-effect is that as you increase the strength of
digital room correction, the listening-position sensitivity increases;
mostly you hear this as a HF comb effect where moving your head an inch
or two left or right changes the tone balance. Depending on your choice
of music this can be more or less annoying. To hear at its most
intrusive, listen to pink noise ("with EQ" on the test signals menu).
(Also listen to pink noise without EQ - the effect happens in normal
un-DSP'd playback too, because of the room reflections).
In the end, digital room correction works best when it has the least to
do...
--
inguz
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