Room2; Surround Chamber; The Algorithms - Lexicon PCM 90 - REV User Manual

The Algorithms and Their Parameters
This algorithm is a variation of the Room algorithm in the PCM 90 with different

Room2

Shape and Spread characteristics, and an overall higher gain. This algorithm
provides an excellent simulation of a very small room which is useful for dialog
and voiceover applications, but which may be too colored for some sustained
musical tones. Increasing the Size/Shape/Spread parameters produces an
excellent reverb, and an Infinite parameter allows you to freeze the reverbera-
tion for as long as you like.

Surround Chamber

This algorithm is similar to the PCM 90 Chamber, but has a mono output. This
ouput is added to the output of another reverb block 180° out-of-phase to allow
a surround decoder to identify which signals are to be routed to the surround
channel.
Note: This algorithm must be used through a surround decoder to avoid
undesireable effects. When used with another reverb block (as in the Matrix
Chamber algorithm, its entire signal can be canceled out when used in mono.
In stereo, Surround Chamber can cloud the mix if it is of comparable loudness
to the Chamber side of the algorithm.
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