James, you're actually referring to a so-called "bi-amping" feature that some receivers advertise. The Pioneer is a fine unit, but that feature does nothing of value. True bi-amping requires two separate amplifiers, as the term implies, and receivers have only one, distributing its power through several channels of output transistors. Output transistors act as valves to add power from the one main power supply section present to the small input voltages to make them strong enough to drive the speaker to a loud level; they have no power of their own. The power supply section has a limited capacity and distributing it to a speaker through two sets of output transistors(one previously not connected to a speaker)rather than one can't double the available power, as some imagine, or increase it in any degree. Wire your speakers in the usual way; no extra power capacity is available through that feature.
