Current setup- Denon avr-s720w, LG 4k player and a roku ultra 4k, want the nvidia shield. LG 75" 4k led tv. Ac infinity on the Denon. Google assistant. R+L are the polk audio monitor 70, center is a polk monitor 60ii, dual polk audio psw505s, side surrounds polk monitor 40ii and atmos speakers are the polk omen3 satellite speakers. Reference set at 75 db. Subs bumped up about 3 db. I'm just not happy with it. Think I need better subs first. Any ideas or suggestions?