I wanted to try LE so I installed it on a NUC 2820 using Generic.x86_64-9.1.002.img via a USB drive. I have the NUC connected to a Marantz AVR via HDMI and that is connected to the TV.
What I noticed is that the audio was very low compared to other devices I have connected to the AVR. As you might imagine, this is pretty annoying to have to reduce the volume before I switch to watching the Cable or Netflix (on Fire TV) and to have to increase the volume to watch something on LE.
I might have used the volume amplification and made that the default for all media but unfortunately, I have a shared database for other Kodi installation across the house. Increasing the volume that way would make every other setup loud and their usage annoying.
I checked alsamixer which shows everything at 100% but changing things there has no effect on the level of volume; reducing it all the way down doesn't decrease the audio output a bit. So alsamixer might not be the right place to make any changes.
I have audio passthrough enabled with 7.1 "best match" configuration; I had "optimized" earlier and it was the same. To get any sound coming out of LE, I had to choose ALSA PCH MJI Maratnz; ALSA PCH default didn't produce any sound.
Kodi's own volume is at its max. I can't think of anything to increase the audio levels on my LE; can you?
Thanks