John, the 14ga wire is ample for all your needs. Since the excellent article by Mr. Russell, a highly-respected veteran audio professional, hasn't been cited for a while, here it is. As you note, using the standard applied(i.e. speaker wire resistance not more than 5% of nominal speaker impedance), 14ga would be suitable for a 60 foot run to 6 ohm QS8s(the table stops at 50 feet).

-----------------------------------

Enjoy the music, not the equipment.