Julian, again here what you "find" isn't really there. The fact that the VP180 has two sets of terminals would be only a minor convenience on the road to the modest benefits that would be realized from true bi-amping. This would require two separate amplifiers(as the term "bi-amping" implies)and a separate electronic crossover preceding the amplifiers so that each would receive only the desired frequency range to amplify. The internal speaker crossover would have to be removed or at least by-passed, as Chris's comment implies.
These steps are nearly never taken in home audio use. Your question of a possible "huge" benefit suggests that you've read the advertising nonsense put out by some receiver manufacturers touting an alleged "bi-amp" option. A receiver can't bi-amp; it has only one amplifier outputting through several channels. The power is limited by it's single main power supply section. Distributing this power to a speaker by way of two sets of output transistors(which have no power of their own and simply act as valves to distribute the required amount of voltage to the speaker from the power supply section)instead of one can't double the available power or increase it by any amount.
I was dismayed to note the $40.00 additional that would be charged for the second set of terminals; I'd suggested that $1000 would be an appropriate premium.
