Rogue Zues with Vandersteen 5A's at 2004 HE Show

Actually, all Vandys that I am aware of, are all capable and recommended for bi-wiring/bi-amping. The subs are a separate time, and the "bass" amp in the 5As drives the subs only, not the woofers. Based on RVs typical recommendations, I imagine the Zeus' were being used in vertical bi-amp mode, with each amp taking one channel, and each side of each amp driving either the woofers or the mid/tweeters. 'Course, I wasn't there, but I would be willing to put money on that, if RV were involved in the setup.

Zippyy- themadmilkman is correct that RV recommends vertical bi-amping. I have absolutely no electrical engineering knowledge, but I can say that I used a vertical bi-amp system with Vandy 3Asigs with great success for several years. Many others as well. And yes, there are two sets of terminals on each speaker, one for the woofers and one for the mid/tweets. This is true for all Model 2 and 3 speakers that I have seen. The Model 4s, which had a passive sub, had three sets and required bi-amplification (at least). Conceptually, you can think of the 5s are an extension of the Model 4 design, with built-in subwoofer amps, or a 3Asig, with built-in 2Wq subs.

Zippyy- I used a pair of McCormack DNA 0.5 Rev A+ (soft recovery diode). I only used them vertically bi-amped, since the designer strongly recommended it. IMO, the primary benefit for vertical bi-amping is increased channel separation, imaging, soundstaging. BTW, I also had a pair of 2WQ subs, so the bass was rolled off below 80 hz, therefore not putting too much of load on the amp in that regard.

Zippyy- check out the Vandersteen web site; I suspect that there is a white paper on this. I am pretty sure there is a discussion in the Model 3 owners manual, which may be available to download as a pdf.