i’m almost afraid to ask this question. i have an old sonos and they are offering a trade up program with 30% off on a new system including their home theater 5.1 with 2 speakers, sound bar and a sub. i like the wireless aspect but is trying to compare a sonos 5.1 home theater speaker system to a marantz receiver, a pvs sub and a couple speakers like comparing apples to tacos. my family of four want to upgrade the sound of movies and I want to introduce the boys to a variety of great music using mostly streaming services. is the quality significantly better with a receiver or do I just have more control than with WiFi speakers like Bose or sonos ? do i really need a receiver?