Phase And Attenuation - Yamaha O2R Owner's Manual

32 MIXING Display Functions
1. Press the [ /ATT] button.
Ø/ATT
The /ATT page
appears.
2. Select a channel using
the [SEL] buttons or the
CURSOR buttons.
3. To change the phase,
press the [ENTER] button.
The NOR icon changes
to REV and is
highlighted.
4. To change the
attenuation, rotate the
encoder wheel until the
desired value is shown.
5. To set all channels
(except the stereo
output) to the same

phase and attenuation,

double-click the
(ENTER) button.
02R User's Guide

Phase and Attenuation

Phase
The Phase function reverses the phase of an input signal by 180 degrees.
The phase can be set for MIC/LINE inputs 1 to 24, TAPE inputs 1 to 16, and
the effects returns. Phase reversal can be used to compensate for incorrectly
wired balanced cables and microphones. When a snare drum is miked top
and bottom, the channel connected to the bottom microphone can be phase
reversed to prevent phase cancellation.
NOR—normal phase
REV—reversed phase
The Phase functions of adjacent channels are not linked when those
channels are configured as a stereo pair. Likewise, the Phase functions of
odd and even channels 17 to 24 always work independently. The effects
returns have only one phase control each, so the left and right signals of
these channels are always controlled together. The stereo output does not
have a phase reverse function. Phase can also be set on the View 1/2 page.
Attenuation
After A/D conversion, input signals can be attenuated using the
Attenuation function. Signals can be attenuated from 0 dB to –96 dB in 1 dB
steps. The stereo output can be attenuated from +12 dB to –96 dB. For the
TAPE inputs, the Attenuation function comes after de-emphasis.
Attenuation can be used to compensate for level increases caused by EQ
boosting or dynamics processing. Instead of using a GAIN control to
reduce a boosted signal, it's better to use the Attenuation function.
Although levels can be reduced using the GAIN controls, this also reduces
the level of the signal being fed to the A/D converter, which is not desired.
The Attenuation function comes after the A/D converter, so conversion
performance is not affected.
The Attenuation functions of adjacent channels are not linked when those
channels are configured as a stereo pair. Likewise, the Attenuation
functions of odd and even channels 17 to 24 always work independently.
The effects returns and stereo output channels have only one Attenuation
control each, so the left and right signals of these channels are always
controlled together.
Attenuation can also be set on the View 1/2 and EQ 1/2 pages. However,
operation for input channels 17 to 24, and MIC or TAPE channels
configured as stereo pairs is as follows: since only one attenuation control is
displayed on the View or EQ page, the attenuation functions of each
channel are linked to preserve their relative settings. If the channel whose
control cannot be seen reaches the minimum or maximum attenuation
setting, a message appears.