Most earbuds give you a simple choice: noise cancellation on, or off (transparency mode). ActiveSense on the QuietComfort Ultra Earbuds 2nd Gen makes that choice smarter.
The Basic Idea
Think of it as transparency mode with a brain. Instead of just letting all external sound through, ActiveSense listens to your environment and makes decisions about what you probably want to hear.
Sustained background noise like train rumble or air conditioning? It reduces that. Sudden important sounds like someone calling your name or a car horn? Those come through clearly.
How It Fits With the Other Modes
Your earbuds have three main listening modes:
Quiet Mode — Full noise cancellation. The world goes quiet. Best for focus.
Aware Mode (with ActiveSense) — This is where the smart stuff happens. You hear your surroundings, but the earbuds smooth out the experience.
Immersion Mode — Full ANC plus Bose's spatial audio effect. Maximum immersion.
When ActiveSense Helps Most
Walking in the city: Hear traffic and people around you without every car engine at full volume.
On public transit: Hear announcements clearly while constant train rumble gets dialed down.
At the office: Notice when someone's trying to get your attention without constant HVAC drone.
At home: Hear the doorbell or kids calling without every household sound competing with your music.
Switching Modes
Press and hold the touch-sensitive area on either earbud to cycle through modes. Or use the Bose app for more control. You can set up shortcuts so left and right earbuds do different things.
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