Sennheiser ASP 1 Instructions D'utilisation page 4

Application example
Two ASP 1 antenna splitters can be used to make an 8-way
diversity split.
Dia. 2: Connections for an 8-channel system (DC connections, not shown here, as per dia. 1)
Dia. 3: Linking two 4-channel systems (DC connections, not shown here, as per dia. 1)