Nope. Zero. Nada. And why should it? Because of 20 cm more cable length? Impossible.
If you want to learn why balanced usually is nonsense or imagination read the posts from nwavguy about active grounds etc, and solderdudes paper 'resistance, impedance, and other issues':
http://www.mediafire.com/download/82kf0r5kdckdcer/resistance%2C+impedance+and+other+issues.pdf
On page 11/12 he explains balanced myths pretty well, and you will also understand why there is even less advantage with the JVC, as it has the optimal cabling (4 wires, ground lines connected at the plug) already.
I don't want to discourage you to do the 'perfect cabling mod', but reality is that you will not be able to measure an impedance difference between the old and the new cable. As the drivers have 15 Ohms the cabling wil not cause any audible change until it reaches several Ohms...which will not happen unless it is broken...