CTSooner, we are on a fairly similar path it seems - I am currently using Ayre KX-5 Twenty and Vx-5 Twenty with Treos, but planning to upgrade to Quatros in 2019. On carpeting, I would doubt that you're going to have any ringing in those slabs. Interested to hear the results of your power cord experiments, I am going to need a couple of fairly long ones with the Quatros (7 feet to be safe, though I might barely get away with 2m.) I too am strongly inclined to take RV's advice, the guy clearly knows his craft and hasn't led me astray so far 
