You first stated “In Wall”…most people would assume that you meant having the Dot somehow buried in the wall…This would not be good because of the way the Echos uses voice recognition.
Second, ceiling installs are not going to be good either again because of the way sound waves work.
Even vertical installs, as the one I posted above, is not as good as the Dot being on a horizontal surface in a central location.
For localized installs, meaning audio will generally coming from a certain direction, it’s less important.
Your original question was which would be better for in wall because of “Speaker”…The answer is either because “in wall” is bad. For “on wall” either.
Also, your original question almost seemed like speakers didn’t matter because you were focused more on the mics…If that’s your focus then the answer is again either.
Both work great hearing voices. The 2nd Gen has weaker sound than the 3rd because the 3rd is physically bigger and has more noticeable bass.
In reality, both sux for playback but both are great for voice control.
Finally, here’s why I believe I know a little about Echo Devices:
