Lexicon PCM NATIVE ROOM, Owner'S Manual

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Reverb Control
Size
Size corresponds roughly to the length of the longest wall of a rectangular room. In a more
general sense, it corresponds to the overall dimension of some mythical space. This space has a
geometry that causes sound to bounce around. When the room size is small, the “walls” of this
space are closer together and the resultant reflection density increases. When the room size is
large, that density decreases. The most natural reverbs use room sizes that vary from about 24
meters to 45 meters or so, but there are many useful reverbs that are outside of this range.
There is a relationship between this parameter and the Reverb Time parameter. Please see the
Reverb Time parameter for clarification.
Reverb Time
Reverb Time is the mid frequency reverb time (in the frequency above Bass XOV and below RT
Hicut). As such, it is one of the primary controls affecting the length of the reverb tail. It may
be considered to model the reflectivity of the walls in the reverberant space. The parameter
most closely associated with Reverb Time is Size. A large room size with a small Reverb Time
can easily have the same decay time as a small room with a large Reverb Time. Even though
the two solutions may result in the same reverb time, they will sound quite different from one
another. The value that is actually displayed is an approximate reverb time based on both of
those values. The actual time is also highly-dependent on other parameters as well as the audio
material.
BassRT
This parameter controls bass reverb time. It is closely associated with the Bass Crossover and
Reverb Time parameters. BassRT is a multiple of Reverb Time that applies to signal below the
frequency described by Bass Crossover. If BassRT is less than 1.0, then the low frequency part of
the reverb tail will be shorter than the midrange part. If BassRT is greater than 1.0, then the low
frequency part of the tail is longer.
Bass XOV (Bass Crossover)
The Bass XOV parameter is closely tied to the BassRT parameter. It represents the frequency
below which BassRT has an effect. Note that there are two of these parameters in the Room
algorithm. One is tied to BassRT, the other is found in the Pattern settings menu and affects the
BassBoost.