Troubleshooting Audio - AMX Optima Instruction Manual

HDMI I/O Board
To create new virtual matrices, we recommend contacting technical support (see page 40). If you decide
to create them yourself, see page 141 or the XNConnect Help file.
FIG. 48
Example of VMs created for control of sources with limited sink support
Example of Creating VMs (FIG. 47):
The virtual matrices in this example assume no repeaters are used upstream or downstream of the Optima.
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Note: When an input is routed to an output that is already receiving a signal on a different VM, the
previous signal is disconnected and the new one takes its place.

Troubleshooting Audio

Before troubleshooting audio, it helps to understand how the system handles EDID information.
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Important: The Optima does not pass the EDID information from the destination back to the source,
which means the source does not know what the destination's EDID is nor can the source make any
destination dependent changes.
Audio Problems
If the destination device does not output the audio or if the audio crackles, it may indicate that the
destination device does not support all of the features in the default EDID on the Optima HDMI input
connector. Some sources can choose what signal types (audio and video) they are sending to a
destination based on the destination's EDID. Therefore, connecting the source directly to the destination
may work fine because the source chooses, for example, PCM rather than Dolby (since it knows the
destination cannot handle the Dolby). Then when the Optima is installed between the source and the
destination, the source reads the Optima HDMI input's default EDID and so it sends Dolby. But if the
destination cannot handle Dolby, the signal will not work.
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VM 1 – The sources connected to the inputs in orange (Inputs 1 through 6) each support 8
sinks and can be routed to any or all of the outputs in orange on VM 1 (Outputs 1 through 8).
VM 2 – The source connected to the input in red (Input 7) supports only 4 sinks and can be
routed to any or all of the outputs in red on VM 2 (Outputs 1, 2, 3, and 4).
VM 3 – The source connected to the input in blue (Input 8) supports only 3 sinks and can be
routed to any or all of the outputs in blue on VM 3 (Outputs 5, 6, and 7).
The Optima reads the destination's EDID to verify that it is HDMI capable.
The source reads and adapts to the EDID on the Optima HDMI input connector. The factory
default EDID is set to support Dolby, DTS, and high PCM frequencies. This EDID can be
modified by using one of the methods described under "Possible Solutions" on the next page.
VM 2 (red)
VM 3 (blue)
VM 1 (orange)
Optima Instruction Manual