It may be useful for you to know my Amazon Firestick 4K has been working flawlessly over the last year. I have it plugged into my 8 year-old Onkyo. The Onkyo does all the audio and video processing and fires it out to my not-so-smart nor so Sharp TV and my medley of Axioms.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated