Well, in my system I've been able to compare single and shotgun versions of my cables, and I slightly prefer the shotgun configuration. But this is with my speakers and my cables, so your experience could be very different. The sound is a little more robust and forceful sounding with the shotgun setup, but the difference is small enough that if there was a shortfall in another component somewhere I'd start with single wire and put extra $$$ toward that instead. But if you go single wire try to use good quality jumpers and not the metal plates that typically come with speakers. If you still want to try shotgun I'd try to arrange to compare both configurations before committing twice the expense. Also, you may very well benefit more by just spending twice as much on another single wire cable rather than doubling up on a cheaper cable. But again that depends on the cable and possibly your speakers. Just my experience and recommendations, but opinions are all over the place on this topic as said before.
The only physical advantage I've heard in doubling the cable is a decrease in capacitance, which in theory should be a positive but I've no idea if it's enough to be meaningful or if it may have anything to do with the differences I hear in my system. FWIW, and best of luck.
