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© Tieline Pty. Ltd. 2015
Genie Distribution User Manual v1.6
8
Genie Distribution Input Levels and PPMs
Important Note:
·
Input levels can only be adjusted on analog inputs. Digital AES3 source audio is not
adjustable. See
Configuring AES3 audio
for more information about digital in/outs. Input
audio functions can also be configured using the Toolbox Web-GUI. See
Configuring
Input/Output Settings
.
·
Genie Distribution supports input expansion with inputs/outputs 3, 4, 5 and 6.
Expansion inputs 3 to 6 must be either all analog or all digital. Expansion outputs 3 to
6 must also be either all analog or all digital. By default the output selection follows the
input selection, however, inputs and outputs can be configured differently. For example,
if you configure expansion inputs 3 to 6 as analog, you can configure all expansion
outputs 3 to 6 as digital AES3. Adjust the output setting independently if required via
SETTINGS
>
Audio > Output Type > [Select Outputs 3 to 6] > [Select output
type].
Audio Levels and Default PPM Metering
The PPM meters use dBu to express nominal operating, headroom and noise floor levels. Set audio
levels so that audio peaks average at the nominal 0vu point indicated on the front panel PPM
meters. This represents a program level of +4 dBu leaving the codec. Audio peaks can safely reach
+22 dBu without clipping, providing 18dBu of headroom from the nominal 0vu point.
The following PPM settings are displayed by default in the codec. The default settings can be
adjusted via
Settings > Audio > PPM Mode
.
Mono and Stereo Metering
When connected with a mono program the codec will display a mix of inputs 1 and 2 on
PPM1
.
PPM 3
displays the level of return audio.
Mono connection displaying audio on
PPMs 1 and 3
When connecting with a stereo program, the codec displays audio on
PPM1 & 2
for inputs 1
and 2 and
PPM 3 & 4
for the return program audio.