to bi-wire or not?

My speakers, like yours, are relatively high efficiency designs, and my uneducated guess is that as a result we may hear less benefit from doubling the cable size than might be heard when connected to lower efficiency speakers (and/or amps with higher output impedance?).  That said, and as I mentioned previously, I still get a small but still tangible benefit in my system, but I'll be interested in your findings.  Obviously make sure cables are fully broken before making any definite conclusions.  

The main reason for this post is to reiterate that this may be a good time to try the aforementioned banana jumpers in addition to the biwires once you have a handle on the biwire effects.  These are just 3" thin single wires you'd use to bridge each the two positive and negative speaker posts together.  I'm not really sure why this works, but it provided a much greater benefit in my system than just biwiring alone.  FWIW. 

I have never heard of using jumpers simultaneous with bi-wiring but I will give it a try after the shotgun cables are broken in and report back.  I sent Joseph Audio an email about bi-wiring a few days ago but have not heard back.  FWIW, I note that at least one of JA's newest models (Profile) only has one pair of terminals.

@soix: can you explain what exactly you mean by bridging the positive & negative speaker posts together? i always thought you had to remove the jumpers when bi-wiring.

The Cable Co. advisor also suggested trying bi-wiring with jumpers in place.  Apparently this is something Chris Somovigo (StereoVox, BlackCat Cables) advocates.  I tried it in the course of recent bi-wiring experimentation and did not like what it seemed to do the sound.  The sound lost impact and became a little recessed.  Went back to single wire for a while and then the next day, removed jumpers and tried bi-wiring as described in an earlier post on this thread.  Bi-wire without jumpers is what's in place today.  FWIW

Ghosthouse is correct.  Chris was the one who got me to try this using his jumpers, and in my system it was all positive.  Just shows how this cable stuff is really so system dependent.  I too thought biwiring required removing jumpers, but that's not the case.  In my setup I have shotgun biwire cables with spades, so my jumpers are terminated with bananas and bridge the lower and upper positive terminals and same for negative -- just to be clear on how this works.  At the very least it's a cheap and easy tweak to try, and if it works you won't listen without them anymore.