HI Roy,
Each of the players eg cd/md/ipod/etc outputs are hooked up through stacked phono/audio leads to the inputs on the amps except the technics sl-1210mk5 turntable which is hooked up to 1 amp the technics su-a40 power control amp.
Two amps have pre out and each are hooked up to the A800mk2 and A900mk2 amps. Well there are 4 amps and each amp runs 1 set of speakers so ohms are at 4, and higher watt output I think. No bi-wire or bi-amp in my system.
One more thing I NOT an expert on ohms or watts, but I have a lot of hi-fi's and stereos over the years. I have loads of Panasonic portable stereos from the 90's a rx-dt55, rx-dt75, rx-dt707 and love collecting them.
cheers Sean.