V1.1-OCTOBER 2019
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OMNIA MPX NODE MANUAL
Clip Indicator
The Clip indicator is calibrated to flash at 105%. While the Encoder has some internal
input limiting, excessive clip light activity indicates a problem state, and you should
reduce input levels. Generally, the clip indicator going off a few times a day will not be
a problem. Note there is no adjustment on the Decoder side to undo clipping for signals
that are coming in too hot, nor is there a clip indicator on the Decoder since the signal is
already modulated. If the Clip indicator is going off constantly, reduce this level on the
Encoder side.
Bitrate
The factory default (and lowest) μMPX bitrate is 320kpbs. Supported bitrates are 320,
384, 448, and 576 kbps. The choice of bitrate helps you manage the trade-off between
bandwidth use and quality. Lower bit rates optimize bandwidth, while higher bit rates
will increase sonic performance. All bitrates sound good, and most listeners will not
perceive a difference. We recommend using the highest possible bitrate your connection
supports. You can switch bitrates without audible artifacts.
Note that bitrates are averages over time, and there may be periods where certain audio
very briefly demands higher actual data use than these published numbers. The codec will
immediately attempt to reduce the size of the data that follows to compensate. Also, error
correction settings will add some overhead to rate use depending on how they are set. If
set to certain values, error correction can increase bandwidth requirements significantly.
See below for more details on calculating error correction overhead.
Streams
The Output Streams section allows you to specify the IP address and port number of
the Decoder you wish to send to. Two output stream ports are standard, more can be
added by license. To set, click in the IP Address field and enter a valid address using your
keyboard. When you click on the Port field, you can enter a port number directly, or use
the arrows control to index values up and down. The On / Off switch must be in the On
position for a stream to be sent. If you edit settings, you must press Save for changes to
be recorded (a green confirmation message will appear in the upper right corner of the
display when you Save). Note that saving a stream will have immediate effect. Use cau-
tion when making changes to address fields so you don’t break a connection to a decoder.
μMPX uses UDP port 8854 by default.
While you can stream to multiple decoders, you can only do so using one common codec
method and bitrate.
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