LD Systems U300 Série Manuel D'utilisation page 12

LDU300RK2 – 19" rack mounting kit for the installation of a dual receiver (includes blanking plugs and mounting screws).
LDU500RK2 – 19" rack mounting kit for the installation of two single receivers (2 rack-mount brackets, 2 connectors and 1 set of screws included).
Installation
1. Attach connectors (receiver A on the right-hand side, receiver B on the left-hand side).
2. Screw both receivers together.
3. Attach brackets (receiver A on the left-hand side, receiver B on the right-hand side).
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