Some cables that I used in the past that reduced the effect of Hum where the Acoustic Research Master Series RCA cables. Unfortunately they aren't made anymore, but in the past when I had a hum, I used these cables instead and the Hum was virtually gone after. Only noticeable if you put your ear to the woofer.
FAMILY ROOM - Totem Tribe II LCR, JL Audio E-112, Anthem MRX 720, Apple TV, WD HDTV, Panasonic 55" Plasma
BASEMENT THEATRE - Paradigm Studio 100 v5, 690 v5, 10x4 v5, Anthem AVM 60, Outlaw Audio 7700 & 7125, 2x JTR Captivator S2s, X-Box One X, Apple TV 4K, HTPC, JVC NX-5, 106" screen