User Manual

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SECTION 16.1 AUDIO SPECIFICATIONS
Analog audio conforms to SMPTE RP-155. The maximum input/output level is +24 dBu. Nominal input level
is +4 dBu (-20dBFS), and the sample rate is 48 kHz. Levels above 0dBVU are shown in red in the VU meters,
to caution you that overly high levels can result in clipping in recordings.
SECTION 16.2 HEADPHONES
By default, headphones connected to the ¼” stereo Phones jack carry the first two channels of the audio
signal from the bus designated Master 1 – that is, the same audio carried by analog output connectors marked
as Ch. 1 and Ch.2 in the OUT 1 group on the system’s backplane.
The Headphone output is also affected by Solo switches located at the bottom of each control group in the
Audio Mixer. When Solo is enabled for one or more sources – or outputs – only the soloed sources are sent to
the connector. (See Solo in Section 16.7.2 for more information on this feature.)
SECTION 16.3 VU METER CALIBRATION
VU (Volume Unit) meters are located right above the Volume control sliders throughout
the Mixer. The calibration of the VU meters can be changed to suit your preference.
A menu at left beside the Input labels opens a small menu (Figure 198) offering three
options as follows:
• dBVU – most familiar to users of typical analog audio mixers
• dBFS – dB ‘Full Scale’ – the digital standard; see the heading Audio Headroom in Section 3.12
• dBu – based on a voltage of 0.775 VRMS (a shy scale rarely seen in public, supplied for completeness,
comparison, and the amusement of audiophiles)
SECTION 16.4 EXTERNAL SOURCES
Columns in the first set of control groups are numbered as Input 1-(varies by model). Each of these can be
assigned to any available audio source – whether analog (line level) sound supplied to rear panel connectors,
SDI embedded audio from one of the four SDI inputs, available NDI source, or other system audio source
(including network audio sources like Audinate’s Dante™, with appropriate drivers.
*Note: Dante support requires an inexpensive user license from Audinate™.
You may choose to think of these audio sources as being associated with the same-numbered video inputs in
the nearby rows on the rear connector panel. This linkage, though the default, is not strictly enforced,
however. You can connect directly to any external audio source in the Advanced Configuration panel (see
Section 16.10). Also, for reasons of your own, you may well prefer to treat various audio sources as
independent of the nominally associated video input. The Follow (audio follows video) features play an
important role in this context – see the sub-heading Follow Program Video in Section 16.10.2.
FIGURE 198