[mo123]

could someone explain the following to me:

- EAC3 7.1 is broken on all FireTV firmware. I suggest disabling EAC3 and use Dolby Transcoding _and_ speakers set to 2.0. It makes no sense to passthrough if you can output 6 or more PCM channels

Specifically, 'use Dolby Transcoding and speakers set to 2.0" .. what does the mean, what are the specific settings within Kodi, and how do those Kodi settings solve this problem. I've only been able to to get Dolby via HDMI passthrough, and when I turn it off, I get a 2 channel PCM signal (over hdmi).

something isn't clicking for me... thx in advance!

Better use SPMC if you are using a FireTV device as it's more optimized for it.
Amazon doesn't care about all the pass-through capabilities, as long as their streaming services can only work.
If you are serious about pass-through I would suggest you get a device that supports Kodi/Android's official API like IEC61937.

Someone else can perhaps explain the transcoding.