This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.
Tone controls can be adjusted in the Settings for each zone with an amplifier (Play:1, 3, and 5, and Connect:AMP).
In your controller, go to Settings > Room Settings > [select the room] > Music Equalization. On that screen, there will be slider controls for the Bass and Treble.
I just did an experiment and could clearly hear a difference changing, especially the Bass on my Play 3 stereo pair
Arc + Sub (Gen 1) + 2 x Play 1/ Stereo Play 3s/ Era 100 Stereo in Kitchen, One Stereo in Bedroom, Play 1 stereo pair in Study, Play 1in Bathroom, Sonos Move 2
Arc + Sub (Gen 1) + 2 x Play 1/ Stereo Play 3s/ Era 100 Stereo in Kitchen, One Stereo in Bedroom, Play 1 stereo pair in Study, Play 1in Bathroom, Sonos Move 2