Lexicon 300 - V3.0 REV 1 Owner's Manual page 76

300 V 3.0 Owner's Manual
BASS (Bass EQ)
TREB (Treble EQ)
LTRB and RTRB
BXOV (Bass Crossover)
TXOV (Stereo Treble
Crossover)
TXLR (Independent
Treble Crossover)
SPEQ (Spatial EQ)
4-20
Stereo Adjust EQ and Spatial Page
BASS is a 6dB/octave shelving EQ control with a range of +6 dB boost and -18dB
cut. It moves in .50 dB steps from +6 to -6 dB. The crossover point is adjusted
with BXOV. BASS acts on both stereo channels equally.
TREB is a 6 dB/octave shelving EQ controls with a range of +6 dB boost and
-18dB cut. It moves in .50 dB steps from +6 to -6 dB. The crossover point is
adjusted with TXOV. TREB acts on both stereo channels equally.
These controls allow independent adjustment of left and right treble. They may
be used together with the stereo adjustments to create a 12 dB/octave cut or
boost. Note that the 3 dB frequencies can be different from the stereo set.
BXOV sets the crossover point for BASS. When BASS is set to full cut, the level
is -3 dB at the frequency set with BXOV.
TXOV sets the crossover point for TREB. When TREB is set to full cut, the level
is -3 dB at the frequency set with TXOV.
TXLR sets the crossover point for LTRB and RTRB. When either is set to full
cut, the level is -3 dB at the frequency set with TXLR.
SPEQ sets the amount of a crossfeed between channels. The signal first goes
through a 6 dB/octave low-pass filter whose frequency is set with BXOV.
When SPEQ is set positive (above 0) the crossfeed has a negative sign. When
SPEQ 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 circuit 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 raising SPEQ is to increase the sense of spacious-
ness and depth of the sound. It is particularly useful on material recorded with
panpots, or coincident and semi-coincident microphone technique.
When most of the bass in a recording is in the sum (mono) channel, raising
SPEQ may reduce the bass level. This effect can be compensated for by raising
the overall bass level with BASS. Since both controls use the same BXOV
setting, this compensation will be quite accurate as long as SPEQ is set to less
than 3 dB boost.
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