Connections; Hdmi Video Inputs And Outputs; Audio Connections - a-them AVM 90 Operating Manual

4.0 CONNECTIONS

4.1 HDMI VIDEO INPUTS AND OUTPUTS

An HDMI connection carries video and audio together. Connect HDMI output from MRX to a display with HDMI input –
one with the appropriate version of High-bandwidth Digital Content Protection (HDCP) is required to display copy-
protected material.
Insert HDMI cables gently because the connector is more delicate than traditional ones. Damaged cables can damage
jacks, and the warranty does not cover jack replacement. Therefore, replacing HDMI cables is recommended if there is
any chance of damage with the existing cable.
Use only certified High-Speed cables and connecting devices. Cables and connecting devices that worked in an older
setup do not necessarily work with newer video formats such as Deep Color, UHD, or high frame rates. If you are using
adapters or port savers, start troubleshooting by eliminating them since they can affect bandwidth.

4.2 AUDIO CONNECTIONS

HDMI Audio Inputs and Outputs
Digital audio sources can be connected using an HDMI, coaxial, or optical cable. These connections carry linear PCM,
and bitstream (Dolby Digital, and DTS audio formats).
An HDMI connection is generally preferred to ensure the use of lossless audio when sources provide it, although you
can also use optical/coax connections for sources outputting 2-channel PCM, Dolby Digital 5.1, and DTS 5.1 without
affecting audio quality. HDMI outputs restrict audio to 2-channel PCM since these outputs are intended to connect to a
television.
HDMI Enhanced Audio Return Channel
If your television provides audio through HDMI eARC (Enhanced Audio Return Channel), for example, when it accesses
streaming media sources, it can send the audio to the MRX/AVM's HDMI output 1, eliminating the need for a separate
audio connection from the television.
If the display reads "Dial Norm Offset -4.0 dB" at the start of a movie, it is indicating that the encoded level is higher
than standard by 4.0 dB. The playback level of all channels is then automatically reduced by 4 dB.
Optical and Coaxial Digital Audio
If HDMI audio from a Dolby Digital, DTS, or 2-channel PCM source is problematic or takes too long to switch, we
recommend the use of an optical/coaxial audio connection (you can still use HDMI for video). Older cable and satellite
devices often benefit from this.
The optical output provides a pass-through of the in-use optical/coaxial input.