There are no user tone controls for the Alexa devices (nor is there one for the Google Home) You would need to pass the audio out from a Dot to a stereo amp where you could adjust the tone. FYI, I have both an Echo and a Google Home. The tonal balance of the Echo is on the treble side, whereas the GH tonal balance is more on the bass side. I find the Echo more appropriate for voice/talk radio and the GH better for music listening.