Just curious, why the RJ45 connection instead of a binding post anyway? It doesn't appear to be for convenience, so is it the sound?
Just guessing here, but maybe the RJ45's extra wiring allows the Icon to know that it's been connected to the S1 speaker, thereby engaging the proprietary frequency curves for driving that speaker?
BTW, I'm a bit surprised by all the hullaboo over using Ethernet cables for the speaker cables. Has everyone forgotten the massive interest in braiding Ethernet cables, particularly just a couple years back? If I remember correctly, such designs were not only inexpensive but noticeably superior to the standard alternatives. In the context of a $249 speaker amp/preamp/headphone amp/USB DAC, I was actually delighted that NuForce decided to take a hint from DIY and introduce everyone to the advantages of using Ethernet cabling for speaker cables, rather than settling for the usual cheap zip cords.