I have my Mirages bi-wired with my Denon AVR-3200 which is almost 4 years old. There are four banana plug connections on each end for the mains and centre. I haven't noticed a new receiver or amp that does the 4-4 connection anymore. It's 4-2, with the amp or receiver only taking a L/R signal and I guess splitting it as it passes to the speakers. That's why I got a funny look from a hi-end dealer when I asked for Cardas with 4 plugs on each end. He mentioned something about avoiding using speaker A&B in such a setup (which my Denon doesn't do). All the receivers in his shop has a Speaker A-B setting on the front. Is there a reason for this? Is a 4-2 connection still bi-wiring? Does it produce a better sound than 4-4?