to bi-wire or not?

+1 akg.  Very speaker dependent.  I have compared single vs. shotgun biwire Satoris on my Soliloquy 6.2s and prefer the biwire, but the difference is not night and day.  On my cables, the high frequency cable is a standard Satori cable and the midwoof cable is specifically designed for that purpose -- not sure how much that is driving the difference between bi and single wire.  I believe Robert at AZ will custom build a shotgun pair for your specific purposes and speakers, but you might want to check on that.  If you're in the NYC area you're welcome to borrow mine for a bit.  

What actually made a bigger improvement than biwiring was adding thin wire jumpers in the banana connectors ALONG WITH biwiring (this was recommended to me by a cable designer that I tried with great skepticism).  This tightened the bass up noticeably and improved imaging to the point that I wouldn't listen without them.  I got mine a while back from Stereovox (now Black Cat?), and IME this is a cheap (and relatively obscure) tweak everyone should try if they can.  

Anyway, hope this helps and best of luck.  BTW, great speakers.  Ironically my final decision was between my 6.2s and the RM22s, and it was a VERY tough decision.  My next speakers will almost certainly be JAs. 

Richard Vandersteen is a proponent for bi-wiring, but as akg points out, it is speaker dependent.
But, if the speaker manufacturer made the speakers bi-wire-able, then they probably should be.
I think your dealer should be able to provide a loaner pair for you to try, too.
B

+1 gdnrbob  

To OP, does Joseph Audio recommend biwiring?  As gdnrbob said above, get loaners from your dealer and check it out for yourself.

Vandersteen crossover designs are optimized for true biwiring and I have, in 30 years of Vandersteen's, never run them any other way.

@vinylbliss I own Joseph Audio speakers and I kind of "bi-wire" them. Before I did so I asked Jeff Joseph if he recommended it. He said he didn't think it made much of a difference. I like the effect, but the way I'm approaching it is not transcendent by any means. I only did it because for not much more money I could get the end of my speaker wires to be quad wires on the speaker end (allowing one pair low and one pair high attachment) and single wires to the positive and negative poles on the amplifier. I don't consider this a true bi-wire, which as others note is two separate cables independently from the speaker to the amplifier.