Extron Electronics IN31608 - Manual (Page 8)

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2001 - INLINE, Inc. IN31608 OPERATION MANUAL - REV 1.6 1/4/01
INPUT VOLUME
If the Mute Button is depressed simultaneously with the Volume Up / Down Button, the input volume for the
currently selected input is affected instead of the output volume. In this case the Input Button’s LED flashes
until the maximum / minimum input volume is reached. By adjusting input levels, the levels of all the various
input sources can be equalized. This is important so the volume level does not increase / decrease dramatically
when switching between inputs. The input volume information is retained in non-volatile memory and can only
be modified by the procedure described on the previous page.
The actual volume adjustment is calculated by adding the input volume setting and output volume setting
together, and truncating the total at a maximum setting of 255. The total volume is mapped to a linear scale
from -96.0 dB to +31.5 dB in increments of 0.5 dB. A total volume of 0 corresponds to -96.0 dB and a total
volume of 255 corresponds to +31.5 dB. The default input value is mid scale (128) to allow for maximum input
volume adjustment in both directions. The default output value for both left and right channels is 52, so that the
default sum of input and output volumes for both left and right channels is -3 dB.
UNBALANCED AUDIO SETTINGS
INPUT AUDIO LEVEL STIMULUS = -10 dBm
INPUT AUDIO LEVEL SET AT 128 DECIBALS
OUTPUT LEVEL
VALUE YYY
GAIN
(dBm)
OUTPUT LEVEL
VALUE YYY
GAIN
(dBm)
120 18.0 55 -14.5
115 15.5 50 -17.0
110 13.0 45 -19.5
105 10.5 40 -22.0
100 8.0 35 -24.0
95 5.5 30 -27.0
90 3.0 25 -29.5
85 0.5 20 -32.5
84 0.0 15 -34.5
80 -2.0 10 -37.0
75 -4.5 5 -9.5
70 -7.0 0 -42.0
65 -9.5
60 -12.0
INPUT AUDIO LEVEL STIMULUS = 8.5 dBm
84 18.4
INPUT AUDIO LEVEL STIMULUS = 0.0 dBm
84 9.94
Note: Input and Output audio levels are summed internally to give the total audio level