Sony MHC-V42D Help Manual page 59

A: First system (Party Host)
B: Second system (Party Guest)
*
C: Last system (Party Guest)
D: Continue the connection until the last system.
* Connect the system which is not equipped with Wired Party Chain function at the last system, otherwise the chain will stop at that system. Be
sure to select the AUDIO IN function on this last system.
The last system is not connected to the first system.
You must select the first system as the Party Host so that all the systems are playing the same music when the Wired
Party Chain function is activated.
Related Topic
Enjoying music playback with multiple audio systems (Wired Party Chain function)
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