it shows one wiring scheme.
for example ,
amp1out is F/RH+ of amp1 ,
amp2out is F/RH+ of amp2 etc.
and 'to speaker teerminal ' is the corresponding speaker terminal.
repeat it for other outputs like ,
amp1out --> F?RH- etc for the next set.
for this total wiring , you require an 8 pole 4 way switch.