I'm not positive either, but I think his amplifier is set up for bi amping, but the speakers he's looking at only have a single set of terminals.
Fossil, if you used an active crossover before the amplifier, this will have to be removed. If you want to continue using this amplifier, simply don't use one of the sets of binding posts. I don't know of any amps that <b>require</b> you to biamplify with them.
Is this two way speaker you mentioned a DIY project or a commercially available speaker? I'm assuming its a commercially availble speaker. If you're willing to tinker with the crossover a little bit, odds are you can make it bi-wirable.