Yamaha O2R Manual Do Utilizador

MIXING Display Functions

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.

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.

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