A:AnswerNo. All audio is connected via Bluetooth, the cable is only used for charging.
Use the Bluetooth in your MacBook Air to connect to the Bose speaker.
A:AnswerMono, unless connected to another flex speaker via the Bose app. Was able to connect to Bose micro, but then both speakers only played in mono, since did not have 2 flex
A:AnswerYes. There are a few different ones. I think there is a basic Bose speaker bar for your tv. Or there is a set you can build. I haven’t tried them but yes. They exist.