The Firestick 4K supports DLNA. I have never used it but apparently it works.

It supports these media formats via HDMI (no analog out):

AAC-LC, AC3 (Dobly Digital), eAC3 (Dolby Digital Plus), FLAC, MP3, PCM/Wave, Vorbis, Dolby Atmos (EC3_JOC)

I am not trying to push the Firestick 4K by the way. I am just trying to understand the differences between all these streaming devices.

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