So,.... I've got a Yamaha RX-V675, playing 4k's through an xbox one s, listening through Mission floorstanding M33i's and watching on a JVC 4k Fire TV (49"). I've a yamaha box set of NS40 5.1 speakers.
I'm thinking of upgrading my amp to either the Sony STR-DN1080 or the Denon Avr-x3600h...