Mark, add me to the consensus. Since you mentioned
Blue Jeans , note that the brief explanation on their site points out that shielding isn't necessary for speaker wire because of the relatively high current being delivered into a relatively low speaker impedance. For example, the typical 1 watt used for a comfortably loud average listening level into 4ohms would involve a current of 0.5 ampere( square root of 1/4, from Ohm's Law), while a brief peak needing 100 watts would involve 5 amperes of current. These numbers might not seem too big, but grossly inflated current numbers are sometimes trumpeted in manufacturer hype about "high current" amplification, and should be disregarded as meaningless; Dr. Ohm decides this, not them. The current is nevertheless far more than that in a line level coaxial cable driving the thousands of ohms of impedance in an amplifier and can't be affected by any EMI field normally found in a home(except maybe one with Bren's nuclear reactor in it).
So, that 5000UE would be fine, as would any similar wire from other sources which might be available to you locally at lower cost. Actually, for the length of runs that you mention 12ga wouldn't be essential and 14ga would serve. For a general explanation of speaker wire by a veteran audio professional, including a table of suggested gauges, you might study
this site if you haven't already done so.
