Any advantages to bi-wiring speakers vs. single

I used to bi-wire my old MTM speakers. Why? because I had 2 sets of wire and the speaker had 2 sets of binding posts. Was it better than a single wire? Slightly, but not enough to spend tons of money on if you don't already have the wire.

Now I have Apogees and bi-wiring is mandatory. The difference is not even remotely subtle - it is huge.

So YMMV, but without the extra speaker posts you will never know, and as others have said, ask the manufacturer their opiniion.

You won't know until you try it

If biwiring doesn't sound good I usually change the speakers. ;)

I have single wire, biwire and triwire speakers. If I were given the choice I would go for single wire. I have biwired, biamped etc and single to me gives the best overall sound. I use to biamp my Duetta Sigs but when I get them renovated I am going to change them to single wire also. Why; I just think one amp seeing one impedance load traveling down one wire compared to 2 amps seeing 2 quite different impedance curves traveling down two separate wires is far simpler and likely to sound better. YMMV

Single wire is good. Bi-wiring that much better - eh, I dunno. Bi-amping - now we're talking, maybe (well, at least according to Elliot Sound Products and sites like that). The flexibility is probably worth something plus if you can bi-amp (and TIA moment - I haven't bi-amp'd VR33s) you might find something you'd consider worth the price of admission. Maybe start with http://sound.westhost.com/bi-amp.htm and research more from that?