Manual
10. Application Guide
PLM+ SERIES Operation Manual rev 1.0.0
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The data format allows for auxiliary data which can be used for information on signal characteristics as well as the
sampled audio data. The physical interconnection, as dened by IEC 60958 Type I, species three-conductor
110-ohm twisted pair cabling terminated by an XLR connector. Please refer to section 8.3 for wiring details.
AES3 provides for multiple sampling rates and resolutions of up to 24 bits; this device accepts sample rates from
44.1 to 192 kHz.
10.6.2. System Latency and Delay Compensation
All types of digital audio processing inherently involves a small processing delay referred to as latency. If the
processing chain does not involve analog-to-digital or digital-to-analog conversion, the amount of latency is usually
very small and often may be disregarded.
However, in complex systems involving multiple digital audio components and connections, enough delay may
be generated to cause audio phasing problems. Therefore, the lowest latency is always preferred, and it is always
important to consider system latency delays when calculating and adjusting overall delay for time-aligning multiple
loudspeaker systems.
10.6.3. Connections and Cabling
10.6.3.1. AES Input Connectors
Two AES-3 input signals (each carrying two audio channels) are connected to the XLR3F connectors labelled
INPUT 1-2 and INPUT 3-4 in the AES/EBU (AES-3) input section on the rear panel. Note that the Input connector
types are identical for the analog and digital inputs, so care must be taken when connecting audio, particularly
when analog inputs are used as a backup signal source. Connectors should be clearly labeled to prevent any
confusion.
Note: Never connect a digital signal source to an analog input or an analog signal source to a digital
input.
10.6.3.2. Interconnection of Multiple Units
The AES implementation in PLM+ is designed to be able to daisy-chain AES signals using passive Y-Split cables.
The PLM+ device at the end of a distribution line should be set to TERMINATED; all other PLM+ devices should be
set to UNTERMINATED. If an AES3 distribution amplier (DA) is being used to distribute the digital audio signals,
with one DA output per processor, then all terminations should be on. However, if the AES3 is daisy-chained, only
terminate the last processor in the chain.
Please refer to section 10.6.4 for further information.