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The Cinema Reference also permits you to adjust the PCM Scale
for audio inputs. This scale has two settings, one for AC-3 Modes
and another for Pro Logic Modes.
The PCM scale ranges from 0 to 255, with the factory default (Out
Of The Box Setup) set to 127.
ADA strongly suggests that you do not change these scales.
Adjusting the PCM Scales will lower the level of each input. This is
not the ideal method of level scaling as the levels are being reduced
by the discarding of bits of data. However, if you wish to adjust
either the Upper PCM Scale or the Downward PCM Scale the fol-
lowing steps detail how this is accomplished.
1
While in the Pro Setup Mode, turn the MODE knob until the
display reads either PCM SCALE and then press the
MODE knob. The Cinema Reference’s display will read
PCM SCALE on the top line and the second line will read
a number followed by the words FOR AC-3 or FOR PROL
(Pro Logic).
2
Turn the MODE knob until the display reads the desired set-
ting for the PCM Scale that you have selected. Since
each Input that is on an either an AC-3 mode or a Pro
Logic mode has its own PCM scale setting, you can set
the PCM Scales for other Input Labels by turning the IN-
PUT knob, thus scrolling through all inputs.
3
To exit the PCM Scale Setup Modes without leaving the Pro
Setup Mode, press the MODE knob. If you wish to exit
the Setup Mode completely, turn any of the knobs other
than MODE or INPUT.
Pro Setup - PCM Scale Factors
The Cinema Reference
provides you with the ability
to alter the PCM Scales for
each input set to either an AC-
3 or Pro Logic mode. The
effect of altering the PCM
scale is the lowering of a
devices audio level. This
adjustment to the audio level
does come with a drawback
as the audio level is reduced
by discarding bits of data. As
such it is not ideal.
ADA strongly suggests not
altering the factory default
(Out Of The Box) settings for
the PCM scales.
