Lexicon LEXICON480LV4 Owner's Manual page 84

Lexicon 480L Owner's Manual
Page Two
XOV (Bass Crossover)
XOV sets the crossover point for BAS and SPC . When
BAS is set to full cut, the level is -3 dB at the frequency
set with XOV.
HFC (Stereo Treble Crossover)
HFC sets the crossover point for TBL and TBR. When
TBL or TBR is set to full cut, the level is -3 dB at the
frequency set with HFC.
SPC (Spatial EQ)
SPC sets the amount of a crossfeed between chan-
nels. The signal first goes through a 6 dB/octave low-
pass filter whose frequency is set with XOV.
When SPC is set positive (above 0) the crossfeed has
a negative sign. When SPC is set negative (below 0),
the crossfeed has a positive sign. When the control is
set to either maximum or minimum, the gain in the
crossfeed cicuit is unity.
The result of this control is to change the separation of
low frequency stereo signals. When the control is
raised low frequencies in the sum (mono) channel are
reduced, and low frequencies in the difference (stereo)
channel are raised. With the control at maximum, low
frequency mono signals are completely removed. This
represents an extreme setting which should seldom be
needed in practice.
With material which has stereo bass information, or
which contains some reverberation, the effect of rais-
ing SPC is to increase the sense of spaciousness and
depth of the sound. It is particularly useful on material
recorded with panpots, or coincident and semi-coinci-
dent microphone technique.
When most of the bass in a recording is in the sum
(mono) channel, raising SPC may reduce the bass
level. This effect can be compensated for by raising the
overall bass level with BAS. Since both controls use the
same XOV seting, this compensation will be quite
accurate as long as SPC is set to less than 3 dB boost.
BAS (Bass Left and Right)
The BAS controls are 6dB per octave low shelving EQs
which operate on the left and right channels. Each
moves in .5dB increments from +6 to -6dB, and in 1dB
increments below -6dB to full cut.
8-6
Flip & Swap (Right Channel Phase Invert)
Enables either a change of audio channels, or a polar-
ity inversion in one or both channels. This change is
made in the digital domain. The available settings are:
Channel Position
+L +R NORM
+L-R NORM
+R +L INV
+R -L INV
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DIT (Dither)
Enables or disables dither noise set with the PONS
control as follows:
0 = Dither OFF
1 = Dither ON
PONS
Dither is a low-level pseudo-random signal which is
added to digital audio to reduce quantization noise, in
effect, by replacing it with a "nicer-sounding" noise. It is
possible to filter the quantization noise in such a way
that almost all of the noise within the frequency range
where human hearing is most acute is shifted to higher
frequencies. This is called psychoacoustically opti-
mized noise shaping (PONS) because it takes advan-
tage of the vraiations in the ear's sensitivity to noise
within the 20 Hz - 30 kHz range. This control has been
optimized. Do not adjust.
Shelf
Adjusts the +3dB frequency of the Shuffler shelf.
Shuffler
Shuffler is designed to be used with Binaural record-
ings, or with any recording technique involving only
omnidirectional microphones placed at close dis-
tances (such as true Binaural). It adds a significant
amount of L-R low frequency information. If widely
spaced omnidirectional microphones, or accent micro-
phones, are mixed with the Binaural pair, Shuffler
should be used before the microphone signals are
mixed to avoid a severe boost in L-R information.
Polarity
NORM
INV
NORM
INV