HD621 HDMI Audio Processor
User Guide
Using the default factory settings, the HD621 is optimised for a
Meridian system environment. It allows up to six HDMI sources
to connect to a Meridian system while supplying HDMI video
(and optionally audio) to a display.
While installing the unit, please be sure to follow the safety
instructions provided at the front of this guide.
The HD621 can simply be placed on a flat surface; a rack-
mount version is also available.
To connect sources
Connect each of your HDMI sources to the appropriate HDMI
input.
By default the sources are assigned to inputs as shown on
the back panel labels, but you can reconfigure this using the
Meridian Configuration Program.
If the source is a Meridian HDMI source:
Use the HD621 to switch the video, and connect the
SmartLink audio output from the source to the corresponding
input on the Meridian Surround Controller.
If the source is a non-Meridian HDMI source the audio will be
taken from the HDMI input.
To connect the HD621 to your Meridian
system
If your Meridian Surround Controller supports MMHR:
Connect the MMHR output from the HD621 to the Meridian
Surround Controller with a single SpeakerLink, Cat 5, or Cat
6 Screened Twisted Pair (STP) RJ45-terminated cable.
If your Meridian Surround Controller does not support MMHR:
Connect the SmartLink outputs from the HD621 to a suitable
digital input on your Meridian Surround Controller or DSP
Loudspeakers.
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Be sure to observe the channel allocation correctly. Each socket
carries two channels and you should connect the appropriate
number of sockets for the maximum number of audio channels
to be used.
To connect the HD621 to your display
Connect an HDMI cable between the HDMI Output of the
HD621 and an input on your display.
To connect Comms and power
Connect the BNC or DIN Meridian Comms connector to
another Meridian product in your system.
Connect power (100–240V AC) to the unit via the IEC mains
connector.
Setting up non-Meridian sources
Non-Meridian sources sending audio via HDMI should in most
cases be configured to decode the audio to PCM in the source
component to take advantage of the resolution enhancement
features of the HD621.
For best results configure your source components to get the
highest possible quality audio from your HD621. The HD621
contains sophisticated DSP-based FIFO buffering, reclocking
and up/down-sampling, so best results will be obtained by
configuring your sources so that the HD621 carries out these
processes when required, and not the source.
Here are some points to bear in mind when setting up non-
Meridian sources feeding the HD621:
Make sure that the HDMI source is turned on, and that its
HDMI output is providing audio as well as video.
Configure the source to output PCM.
Pay special attention to the way that the source handles
different content. Check the configuration to ensure that
multichannel material is not downmixed.
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Initial system installation
