AMX DGX800-ENC User Manual

Enova DGX HDMI Boards
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Hardware Reference Manual – Enova DGX 100 Series Digital Media Switchers
Troubleshooting Audio
Before troubleshooting audio, it helps to understand how the system handles EDID information.
The source reads and adapts to the pre-loaded EDID on the DGX HDMI input connector.
The factory default EDID is set to support 2 channel L-PCM audio. This EDID can be modified by using one of the methods
described under “Possible Solutions” at the bottom of the page.
Audio Format Support on Enova DGX Boards
The following table indicates which audio formats are supported by specific Enova DGX boards.
* Dolby Digital and DTS support up to 48 kHz, 5.1 channels.
NOTE: DVI Boards must have their EDID changed to support HDMI signals with embedded audio.
IMPORTANT: Because signals are routed through HDMI, 4K HDMI, DVI, DXLink Twisted Pair, and DXLink Fiber Boards which feature
SmartScale Technology, they normally produce a quality image. If the installation has special scaling, EDID, or HDCP requirements,
see page 175.
Audio Problems
The default EDID for input boards only supports 2 channel L-PCM audio. If a sources chooses to ignore this EDID and send a format
that is not in the EDID, the audio may not pass through the Enova DGX 100 Series Switcher at all or it may be distorted. To present
other types of audio formats to the source, a different EDID must be loaded (see EDID configuration on page 175). If after changing
the EDID on the input board, the audio is still distorted or is not present on the destination device, then the device may not be
capable of supporting the requested audio format with the newly loaded EDID setting. In this case, a standard EDID should be used
and the sources set up to only pass the type of audio that the downstream destination devices can handle.
Checking for Support
One way to check if a destination supports a particular type of audio format is to capture the EDID using the System Configuration
interface’s Save EDID function and then paste the data from the .edid file into an EDID reader program (e.g., www.edidreader.com).
Possible Solutions:
If you encounter audio problems, we recommend trying the following solution:
Use the EDID Save and Load functionality in the System Configuration interface (see page 176) to read the EDID from the
destination device and to write it to the HDMI input on the Enova DGX Switcher.
Audio not present or intermittent with good video
Likely Cause:
A signal containing both video and audio must have space for both signal portions. The audio signal portion lies in the blanked
portion of the video signal. High Bit Rate Audio (HBRA) requires a larger than normal space in the blanked area of the signal. Video
formats with reduced blanking normally provide enough space for audio signals. In a signal that combines a video format with
reduced blanking and HBRA, the HBRA signal is truncated and can present as either no audio or as problematic audio (static,
clicking, absent, etc.). While Enova DGX hardware supports both HBRA and reduced blanking video formats, these formats do not
necessarily work with one another.
Possible Solution:
Change either the audio format to non-HBRA or change the video format to a format that does not use reduced blanking.
Audio Format Support on Enova DGX Boards
Audio Format
Board Types HDMI / 4K HDMI Input Boards HDMI Output Boards DVI Input Boards DVI Output Boards DXLink Twisted Pair Input and Output Boards DXLink Fiber Input and Output Boards Audio Switching Boards (ASB and ASB-DAN) Audio Insert/Extract Expansion Boards (on either the input or the output side)
2 Channel L-PCM
••••••• •
6 Channel L-PCM
••••••
8 Channel L-PCM
••••••
Dolby Digital
• • • • •* •*
DTS
• • • • •* •*
Dolby TrueHD
••••
DTS-HD Master
••••

AMX DGX800-ENC Specifications

General

Brand	AMX
Model	DGX800-ENC
Category	Switch
Language	English