Random Hall - Lexicon PCM Native Owner's Manual

Random Hall

The highly acclaimed Lexicon Hall, Concert Hall, and Random Hall reverb algorithms have
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regularly been used by live sound and recording engineers because of their exceptional ability
to reproduce the musical ambience of large, wide, panoramically wonderful spaces.
Random Hall is similar to Hall, with gradual build-up, well suited to complex sounds like
orchestral music. Its reverberators change over time in controlled random ways to avoid the
buildup of tinny, grainy, metallic, or other colorations. The modulation can be noticeable and is
often a desirable effect. This is one of the classic Lexicon sounds.
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The early reflections are user adjustable in amplitude and delay. Some skill is needed to set
useful reflection patterns. The pattern can be expanded or contracted in time using the "Delay
Master" control, and the overall level of the pattern can be set with the "Early Level" control.
A hall is the principal venue for classical ensembles, but has proven to be useful for all types
of music. A hall is comparatively large, with wall-to-wall distances that are typically several
tens of meters. Smaller halls may be used for smaller ensembles. The characteristic sound
of a hall includes very low initial reflection density, with little reflection energy before 60-
100 milliseconds. Density buildup is more gradual, because of the larger distances between
reflecting surfaces. Reverberation time is somewhat longer as well. Finally, in most halls lower
frequencies reverberate longer than higher frequencies.
One of its charms is a bit of irregularity in the decay. In some cases (very small rooms with
precisely-pitched instruments), this modulation may not be the best choice. But in general, this
is a time-tested reverberator.
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