A:AnswerIt depends on your TV. Both my Samsung Q90 and TCL 55 inch televisions support sound through bluetooth and speakers simultaneously. This can be switched on in the settings menus. I have another TV that doesn't support BlueTooth at all so these headphones would only work wired, but even that old TV (Panasonic Plasma) has a setting to switch the speakers on or off.
A:AnswerI've used them on airplanes and they work for noise cancelling and connecting (via cable) to inflight entertainment. Unfortunately, the bluetooth connection constantly drops and it's more frustrating than it's worth.
A:AnswerNo app for the PC. I have connected through my phone and the computer at the same time and that has switched up the codec to a nicer sound. But really the way to go is an AptX receiver with direct line to it from the computer to deliver the best quality sound to the headset.
A:AnswerNo. These can exceed 100 DB according to Apple's hearing monitoring system. However, sound levels over 90 DB are potentially dangerous to human hearing.
A:AnswerThese are comfy and hardly noticeable when they're on your head. The battery life is very good as well but i would not recommended connecting via aux as it destroys the sound quality